Interesting how a HTPC questions becomes a RAID discussion.
HW wise. Looks sharp. The SSD comments are made..so 128GB it is.
Storage is the thing..I'll give you another, out of the box, thought. The best RAID for movies is called: Friends. They can keep an off site copy of your movie library for you. Once in a while they check it for you, JUST to make sure. And you will return this favour to them. Keeps the costs down nicely. That way you can even have multiple off site backups.
So get an eSata or USB 3 HDD dock and use bare-bone drives. Give each HDD a number as name and keep them in a nice cool/dry place. Make a copy and hand it to the above mentioned friends.
All the movies you rip, you run through this SW http://www.antp.be/
. It will automatically download all relevant data, like album art etc. It will also store the name of the HDD with each movie. Nice clean list of what you have with all the bells and whistles you need to search, comment etc to each rip.
Usability.. run through this db to see what movie you want to watch. Grab the correct HDD off the shelf .. stick it in the dock and off you go.
When a HDD fails.. you will know what was on it. Go to your friends and retrieve the files you need.
For more vital data... Get a WHS2003 box and use it to do an automatic back up for you. Plug in the amount of drive you need and all done.
Simple does it.. And if you have the originals.. is it worth the hassle to invest in large and expensive raid solutions? Just use smaller HDD's.. You will most likely have some lying around. Treat a HDD well.. and it will not fail for a looooong time.
Anyhow.. I also realise we have some data junkies on this forum..in that case.. I'm sorry to have wasted your time. I told you at the beginning it is an out of the box thought....