Looking for Long Run HDMI with 3D...HDMI over Cat5/6? HDMI over Coax? HDMI Wiring?

I'm moving into a new house. It's setup so that the TV is in the front of the living room and the units are in the back of the room. It requires about a 50 foot run through the walls/ceilings, which I don't have access to. It was built in 2004, and the wiring was put in before the drywall was added. It currently has the following cables wired:

DVI
VGA
2 Coax
1 Cat 5 cable


I'd prefer to wire a redmere HDMI cable, but I can't figure out how to do so, and the cables won't move/slide at all for feeding purposes.

What are my options if I want 3D and other high end HDMI requirements?

HDMI over Cat 5? It's only cat 5, will it be stable enough?

EDIT: It is actually cat5e, whether it's the same cable poking through on both ends is another story.

HDMI over coax? Will this cover the requirements?

Yeah, it's Cat5 I think, not Cat5e. Also, wireless isn't a good option. There's no attic above and I really have no idea how to wire anything new since the existing stuff was put in before drywall and i can't get them to budge at all.

Can DVI support 1080P and 3D if I put hdmi converters on each end?

Yes, which gives me an idea that might make wiring not that difficult. I can use the lights and perhaps where the ceiling fan is to bring it to each end.

Here are two photos. Yes, the floor colors are different as I've had the floors stained since I bought the place (the second photo was while the previous owners still lived in it). I also plan on painting all the walls as well (so no more red walls).

The first photo is of the front of the room where the TV will hang.




The second photo is of the back of the room where the units are.

There is access below since there's a garage below...

I'm pretty sure they go up, however, I can't see where exactly.

Thanks!

I'd rather not open the wall, but will do it if I have to.

I just got back from taking a look at the wiring in the house, and this is what I've gathered, good and bad:


The blue cable that I think runs from front to back is actually cat5E not cat5! However, I'm not certain it runs from the front to the back until I test it. There is another white cat5e cable at the tv, however, I have no idea where that runs to and I didn't see a matching cable in the back. I went to an upstairs closet and it's an enormous mess of probably 30 coax cables, IR cables on each side. One side has stuff all over the place and into an old receiver that the last owner left. The other side looks like where directv might be accessing (still has about 5 coax cables that aren't used).

Did they use to just stuff 100 coax cables throughout the house? That's what it seems like.

Anyway, I'm going to order an HDBaseT system and try it on the existing Cat5e cabling and pray that it's the same one in the front and back. They're both blue, but with the way things are wired in the house, who knows. .

Are there cable testers that work at two different points of the room or do they need to be next to each other?

I already placed my big order last night before seeing the cable tester on monoprice. I might just go to homedepot instead then.

Does anyone know what a cable labeled "from cam" would be?

Hmm, I need to take a look.

I'll take some pictures next time I go... haha.

I figured out that one of the coax cables where the TV will go go upstairs into a closet upstairs, which is good because I wanted to put an OTA antenna upstairs. However, the place I wanted to do it required connecting about 4 different coax cables to get it into the room I want to put the antenna in. When I tested it, it didn't work (might have linked the wrong cables), however, when I attached the antenna half way through the links, I only got 10% reception.

That being said, does length affect the signal greatly? Does the amount of connections affect the signal greatly?