I have an OCZ Vendetta 2 and I think it is great. I had it installed with push pins but replaced them with the 775 bolt through kit from Thermaltake Thermalright LGA775 BOLT-THRU Kit for for Ultra 90/120 & HR-01 Retail Box from Direct Canada and it was cheap. Got MX-2 for it as well... you will not be disappointed by the Vendetta 2 I think. I use the stock fan that came with it but some suggest replacing it with a 'better' fan, that is your call.
I went with the Corsair TX750 PSU for my setup. I think it should have no problem with Crossfired 4870s from what I read. Modular is nice... and always an option.
Another vote for the Vendetta 2, even using the pushpins it keeps my quad @2.94 below 56*. For a good idea on hardware, check peoples Sigs. At least for the newer rigs you will see alot of Corsair PSU's or the PCP&P Quad 750 silencer, they are there for a reason...
Good suggestions on here. I just wanted to cast a vote against the Zalman cooler in case that was still on your mind- the tower-style coolers are much more effective and Zalman has bad-quality fans (not quiet to begin with and the bearings wore out within 6 months and it was just grinding then). I personally would spend a few bucks more to get the current gen HDDs with 320-333GB/platter. Better density = more speed, fewer platters (less heat/noise). WD makes a 1 platter 320aaks.
Also, I checked my p5Q Pro box for extra SATA cables, and there were none, so it is confirmed that there are only 2 included- make sure to pick up an extra.
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