Opinion on 3x 5970 on MSI Big Bang Rig Build, Need Help

Firstly,

Thanks to the members that have posted so much info for us newbies to go to.

I have searched high and low, and just wanted some personal opinions on the most productive rig.

So with power cost not being a issue, I am building an open rack rig,

3x ATI 5970
Motherboard: Big Bang-XPower LGA 1366 Intel X58 SATA
I will add one more 5970 later on.

My questions are,
What power supply (or supplies) ?
What CPU is the most efficient for mining on this setup?
Reccomendation on what brand ram and how much ram?
I will run extenders for space/air flow on the rig for the extenders.
I am learning all about linux unbuntu from ya guys and want to have it on a SSD Kingston Thumbdrive.

I am new to this, and truly appreciate you guys helping a new guy out!

Thanks