Welcome, welcome, welcome!
If you have cash to blow, then here is your corner!
At this level you can afford to flip Intel or AMD at this stage and I got a build for each!
Corsair HX-1000 PSU - $282.00
AMD Phenom II X6 1090T - $269.00
ThermalTake Frio CPU Cooler - $76.00
ASUS Crosshair IV Formula - $315.00
Corsair 2x4GB DDR3 - $169.00
XFX Radeon 6870 B.E. - $319.00
$1,430 pre-shipping. So you are really tight on 1,500$ with shipping. The CPU is top of the range and the PSU is probably overkill but if you choose (like with 1,000$ Gaming) in several years to add a 2nd GPU, you can do so as this mainboard will run TRIPLE @16x! I also included the CPU Cooler straight up, as you will in all likely, going to want the extra cooling and the 6870 is the new kid on the block, you can drop down a few cards to a 5770 or something but the 6870 is better than the 59xx series slightly (and the X2 GPUs will come out in Jan and drop the prices probably)
Corsair HX-850 PSU - $222.00
Intel Core i7 950 (3.06GHz - Quad Core) - $319.00
ThermalTake Frio CPU Cooler - $76.00
Gigabyte GA-X58A-UD5 - $325.00
Corsair 3x2GB DDR3 - $115.00
LeadTek GeForce GTX480 1536MB - $399.00
$1,456 pre-shipping. As you can see, its a i7! The cheapest one, but none-the-less its X58 compatible and is very beefy at stock. The ThermalTake does open up overclocking potential (which voids manufacturer warranty in most cases) and should stay under 1,500$ after shipping. The RAM is good 9-9-9-24 latency, the motherboard will run SLI and Crossfire (like it matters) and the GTX480 is a monster! The PSU is also a lower wattage since the single 480 needs 600W and you can always go up to the HX-1000 for an extra 60$
So there you go! Some good gaming rigs for good low price. Obviously this does not include hard drives, sound cards, monitors etc...