I'll also add that 2TB is not likely to be enough depending on the size of your current DVD library and certainly won't be enough once you up to bluray.
Also, if this system is going to be in your living room, which I suspect it will given the choice of case and sound equipment, you'll likely want to spend a bit of money on making it quieter, a scythe mini ninja as well as a passive power supply and a large heatsink with either a large slow fan or a passive heatsink for the graphics card, and if at all possible, a lesser expensive and smaller SSD for your boot drive, your system can spin down the storage drives when not in use so you can save quite a bit of noise when not playing from your storage array.
Finally, speaking of storage array, I'll highly reccomend two things, number one, keep your OS separate from your mass storage, it's "just in case" feature number one. Re-installing a corrupt OS or cleaning out viruses will be much easier if you don't have to worry about all your DVDs or music or pictures at the same time, on the same drive(s). Number two, go raid, generally I would suggest raid5, that parity will mean a LOT the first time you have a drive crash, trust me, been there, done that, it SUCKS.