BD-Rebuilder system config

[trueimage]

Hey

I am looking to build an entirely new rig if necessary to get high performance out of BD-RB. I understand that the "heavy lifting" is done by x264. I will mainly be using it to create BD25 "rips", for 25GB BD-R discs.

What are you guys using for hardware, and what are the main components affected? I don't want to spend a fortune but I have a bit of cash to throw at it, especially after parting out my current/old system.

My thoughts:
os: 64-bit windows? or is it not stable enough? I was thinking 64-bit for >3gb ram support
cpu: Intel i7 like a 920?
ram: 8gb (or 4gb if using a 32-bit os)
hdd: 4x seagate 320 7200.11 drives in raid 0 (overkill? what is the hdd read/write level like?)
gpu: does it matter? I have an old 6600gt lying around
motherboard: ???

The reason I ask is, if you say ram and hdd don't matter much, then i can shift resources to the cpu or watercooling or whatever.

Thanks for your input.