First of all I'm building a new system, here's my full build list.
CPU - Intel i7-2600K
GPU - Nvidia GTX 580 (probably EVGA)
RAM - G.SKILL Ripjaws Series 8GB (2 x 4GB) DDR3 1333 X2
HDD - Western Digital Caviar Black WD1501FASS 1.5TB X2
PSU - CORSAIR CMPSU-850TX 850W
MOBO - ASUS M4E
SSD - OCZ RevoDrive OCZSSDPX-1RVD0120
Optical - LG Black 10X Blu-ray Burner
Case - COOLER MASTER HAF X nVidia Edition
All of this will hopefully come in around $2,800 assuming I can get the 2600K for around $300 and the M4E for around $350, I'm not too good with RAM so that might need to be upped. Also I'm trying to build this before January 14th but Sandy bridge releases on the 5th. Does anybody think I will be able to get the 2600K and a M4E on launch day without paying way more than the MSRP? Or even at all since the M4E has no release date yet. In regards to future upgrades I plan to use the system for three years and I'll probably stick in another GTX580 when they're on sale somewhere for cheap, other than that I hope everything else will be powerful enough to play games at 1920x1200 at at least high if not very high.
Do you mean 2 x 2 x 4GB 16GB total or just 2 x 4GB 8GB total? 4Gb if fine for gaming 8Gb will future proof you but 16Gb is overkill. Also you may consider the AMD 6970 card which should be around by then depending on reviews. I will not bother guessing the stock and/or price of sandy bridge when it releases just wait and see.
The RAM was two kits of two 4GB sticks, in regards to upping the RAM I was talking more about getting a higher speed. Also I am not afraid to admit that I'm an Intel/Nvidia fanboy,so 6970 is a no go. I actually read somewhere that it got beat by the GTX580 anyways. I'm pretty much set on everything I want and I'm just waiting for Sandy Bridge to come out, I was about to jump on a 980X until I saw the SB benchmarks.