I have to run new cabling for ethernet Gigabite network:
1) Cat 6 vs Cat 5e, price is almost the same, any reason to go Cat5e?
2) In wall connectors like this:http://www.monoprice.com/products/product.asp?c_id=105&cp_id=10513&cs_id=1051302&p_id=1087&seq=1&format=1#largeimage
Are they Cat 6 or only Cat5e?
3) Can I get a Cat6 (or 5e) cable that already has both end-connectors and cut one off to get it into the in-wall connector as above?
4) Distance: The distances or between 20 and 75 feet: does it make sense to get cable and leave it at that length (25, 50 and 75 feet) or should I cut them shorter to fit perfectly?
TIA

1. if it is the same price or even slightly more go cat6
2. i think rj11 are phone connectors - i am pretty sure you need rj45's that are for cat6
3 & 4. you would be better off getting a box of cable and pulling what you need. a foot or two extra is fine but lots of extra is a waste. you are always smart to have some extra so if something happends you can pull through a 6 inches give or take on each end. any more then that is just a waste.

2)so we are talking about them here?http://www.monoprice.com/products/product.asp?c_id=105&cp_id=10513&cs_id=1051303&p_id=1040&seq=1&format=1#largeimage

3) But then I need to put the male end on one side: how easy is it to do that?

yes that is the right one. if you look at the second image on that link you will notice that there are a bunch of grooves. the raw cable gets "punched" into the jack, then you plug you ethernet cables male plugs into the jacks female end. A word of warning, follow the diagram on the side of the jack and either use all (A) or all (B).

1) Go with cat6
2) what mmcxiiad said. Get cat6 spec'd rj45 connectors. like the second one you linked to
3) just get bare cable, and terminate it at both ends in a wall box with rj45 keystone jacks. then run a patch cord from the box to your device.
4) again, get bulk cable and pull what you need through the walls. Leave it loose,and don't pull hard through corners and tight spots.
5) don't forget to get the proper wall plates for your keystone jacks. You can get dual sockets and run phone at the same time, or plates with cable tv connectors, also.

Couple quick bits of advice:

1) bulk cat6 is comprised of solid core wires, and one can break, potentially rendering the run unusable. Pull wire gently and avoid pulling hard against a corner--feed wire through instead of "pulling" like you would with electrical wire.

Wire up the keystone jacks before the walls are covered up (and wiring inaccessible) and test them to make sure the run is good. Tuck them into the outlet box and cover with tape so the rockers and painters don't goober everything up.

2) putting a male end on solid core wire designed for in-wall use can be done, but you run the risk of the cable failing due to stress. Get some patch cables--they are cheap at Monoprice, and use them for jack to device runs. And wiring up rj45 male jacks is tedious. I basically gave it up when I hit 50 after miles of cable runs and thousands of jacks and plugs installed, because my eyesight isn't as good and my fingers not as nimble.

3) if you are going to wire up the jacks your self, you might want to read up on a few tutorials. There are several ways to wire jacks. It is easy to wire them improperly. You might want to invest in some cheap magnifying reading glasses to help.

4) If you are going to wire up a bunch of jacks, get yourself a tester.

Nothing worse than trying to diagnose a network that isn't functioning, when you have jack or wire problems from the install. Like when a rocker puts a screw through a cable, or your finish carpenter slams a staple or finish nail through one. Or an electrician comes in and runs some 240 parallel to, and touching your cat6, or puts a ballast transformer up against a cable, and you get a bunch of inductance and interference, which will cause errors.

wildrock's explanation brought back all the nightmares i had after the first time i wired my house. very good tips. thinking back, there were very good reasons i chose to surpress those memories.

here it is nice and simple:

sometimes, the money that you think you are saving by not getting all the right stuff and equipment is then spent three times. the first when you initially buy things you are going to use. the second when you have to go back and buy the things that you thought you weren't going to need. and finally spent on your favorite pain medication to figure out why it isn't working.

spend the money up front. do it right once. you will thank yourself later.

one other thing, over cable. either do a jack on every wall OR build in a easy way for you to go back and add more later (like running a pvc pipe inside the wall to be able to pull cables up from one floor to the next. nothing is more frustrating then 6 months later realizing that you should have done one more cable. it is so easy to do before the drywall is up. you never know what other cable you may wish you had later. you can also fun cable for phone, audio & video at the same time as the cat 6 even if you don't plan on using them all at once.

thanks for all the help and advice:
One last question: If I get the females above, it looks like there is no special tool needed to put in the cables like some do. I looks like I just have to put the right wire at the right place and then close that think up for creating a contact. Is that right?

no, buy a punch tool.

Well, you have to put the right wire in the right place, yeah. Some jacks come with a little punchdown tool. Some jacks don't need them because they have a cap that squishes the wire down into the contacts. I think al the rj45 cat6 jacks at Monoprice are the tool-less ones. Though you can use a little punchdown tool to set the wires properly before you cap it. Regular size punchdown tools (like for a punchdown block) won't work on these little connectors.

Have fun!

thanks guys, so if regular punchdown tools won't work, what kind do I need then?

Here's the Leviton Learning Center (http://www.leviton.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=16437&minisite=10028). There's a nice picture of the jack punch tool at the top. :) This is really a nice resource. I've never seen it before. But I've spent enough money on Leviton supplies over the years that I should have bought some stock.

When you buy Leviton, you know what you are getting. I read some reviews about the Monoprice tooless jacks, and they were less than stellar.