Never pay to have someone overclock your system for you. Ever. Besides assisting with builds, we do overclocking for free as well. Anyone that takes money to overclock computers is shady at best.
Well fine, but should I have a SSD boot drive or a 600 gig raptor primary (remember it would be SATA3, but not raid)
Yes, SSD. Even the 600G 10K RPM vRaptor gets owned where it counts by the 1TB 7.2K RPM Samsung F3 drive; and it only costs $90. So with that said, an 80G Intel X-25M for $200 and an F3 makes a mean 1-2 punch.
A GTX470 or a 5850 is more than enough for most screens out there. The GTX480 has issues and will hit 100C just benching the thing. I crashed out benching one as it crossed 110C and the fans didn't spin up. Drivers should fix that, but the fans are loud above 60%; a speed that keeps it from chunking guts. I chose the 5850 to drive the primary and 4th screen, with a 5770 to drive the side pair (3x23" + 19") and does great. If I had it to do over, I'd do a 58xx for the other, but the xx50 was still high priced and the xx30 wasn't out yet.
The 850 is just enough to run an i7 and a GTX480. Maybe you'll never load the i7 up and just the cards, so it doesn't matter. Or does it? Just opt for the i7 930 and screw the overclocking the extreme offers us for a $600 mark up. The 1366 socket isn't here for very much longer anyway, so skimp here when ya can. But if ya think you'll add another GTX 480 for your +2600px screen, you'll want a 1.2KW or more watt unit. They pull incredible loads (for what a 5870 does without speeding up the electric meter and airconditioning). Besides, the CoolerMaster PSU's aren't high quality...they're average.
HD audio onboard doesn't offer EAX. Since you game (by the pick of the high end video card), you'll want EAX ability and some good speakers. I like the Asus Xonar, but if you just game then the Xfi Xtremem audio is needed. Even the old Xfi Plats made the gamer really enveloping; headphones or not. Asus will do EAX5, just not onboard. But with an octal-core CPU, that's not an issue. You can give up a couple percents of one core to do the EAX coding.
Sound coupled with SSD: Xfi sucks with Win7 and an SSD. With 6G or more physical memory, you'll disable virtual memory cause you don't need it. But AudioDG.exe then robs it and will take every spare bit until you restart Windows Audio Service; just to start over the cycle. Even with 12G, they have issues
Their drivers are to blame, not the hardware itself. Asus and AuzenTech have handled it beautifully though (not the Xfi chipped AuzenTech though, same problem).
But please consider sound. If you have the room for 5.1, do it. If you have headphones, still do it. Games aren't just about the eyes or how fast your mouse reacts...sound helps just as much. Before jumping onboard, tanks or footsteps that were [virtually] 50ft away sounded like they were around the corner. Now, I can tell distance based on sound. With onboard, I can hear people screaming from the other side of 2Fort, and that ain't right.