I'd reccomend fx8320 or an fx6300 if you're building lots of rigs. 
I'm all ears, why the 8320? (I'm just building one rig - and I am just gonna do it to support the network - but yeah, I'll take what I can get with Quarks).
Suggestions? (I will use the rig for other things eventually, so probably get a DVD drive, 8GB ram but just on board video - I pay .28 KW/h for electricity, so video card mining is out.)
CPU cooler is a must
Thx
Buy a 4 processor Xeon board.
Don't you see the difficulty? Even that much firepower is NEGLIGIBLE. I think the network hash rate is 4K Mega+
Wow! Didn't realize they had them. Cost? Computer Models to buy?
And As I said I want to support the network, so profit isn't #1 but breaking even would be nice.
Thx
For strict cpu mining, I'd say go with a dual xeon with intel ES cpus from Ebay, or get a dual westmere server pre built (you can sometimes find them for 250usd).
You can get a board for 500 and add two 168usd 8 core cpus to it (ebay has em, search for intel es xeon 2011), and a 75usd ram kit, plus a psu and you're good to go. I reccomend the Corsair HX850 which lends itself well to gpu mining should you get a few nvidia cards for CUDA stuff (you can rent your gear for renders maybe? or just get 280X cards, each draws 200w if undervolted and nets you decent income even with high power costs).