Hi guys, i will be ordering my parts for my new computer in about a week.
I may buy,
e8500/Q9450
9900's/4series when come out(i have a 8600Gt laying around somewhere that i can temporary use)
8gb ocz sli edition
CoolerMaster Real Power Pro 750w
seagate barracuda 500gb 7200RPM 32mb
DvD burner with lightscribe
vista ultimate 64 bit

The only that i need help on is the mobo and cpu. I will want to overclock the cpu,ram,graphic. I will NOT sli. And i will be using this computer for gaming.

Should i buy liquid cooling or air. I have a 2,000 dollar budget and i want to at least have this computer for 2 year+.

Air for dual core, water for quad core since its in your budget.

Any mobo P35, x38,x48. P35 will go to 450FSB easy and the latter two will do 500FSB.

PSU is cr@p. Get a Corsair or PP&C or better. See:
http://www.xtremesystems.org/forum [...] p?t=108088
for PSU tire listing.

CPU (E8400 or similer if gaming, if vidio editing Q6600/Q9300), RAM (make sure it's DDR2 800 from a quality manufacture like Corsair, HDD (any Seagate/WD 7200.11 HDDs), GPU (don't know which one is better since there are no reliable reviews for 4800/9900 cards)l.

If you are a first time builder I would recommend staying away from Liquid cooling, (you have to bleed the water resovor,tubes,etc, and a lot of other stuff). Just get a good quality CPU cooler. The E8x00 and Q9x00 CPUs can easily hit 3.5-4Ghz on a good air set up.

For motherboard look at P35-DS3x, P5K-x

Depending on the cpu, it's either p35 or x38/48. E8500 use 9.5x multiplier, while q9450 use 8x multiplier. P35 will be enough for high overclocking for 9.5x, but not 8x. Get x38/48 for q9450. Still, it's strange that you'd compare the two. Q9450 is much more powerful, so it's not fair comparasion. If you really want high multiplier, use q6700 with 10x.

Update-
e8500
ASUS P5K DELUXE/WIFI-AP LGA 775 Intel P35 ATX Intel Motherboard - Retail
9900's/4series when come out(i have a 8600Gt laying around somewhere that i can temporary use until the release)
8gb ddr2 800 ocz sli edition
seagate barracuda 500gb 7200RPM 32mb
DvD burner with lightscribe
vista ultimate 64 bit

Can someone tell me if the motherboard i picked out is good an also does anyone know if the 9900's/4 series will need an An available 6 pin PCI-E power connector and an available 8 pin PCI-E power connector on the power supply?