Quick question
 

CPU:E8400
Mobo:Gigabyte EP45 DS3L
GPU:HIS 4870
RAM:G.SKILL 2X2GB PC2-8000
CASE: Antec Three Hundred
PSU: Antec Trupower Trio 550W
HS: Xigmateck Direct Touch 3 Heatpipe heatsink w/ Xigmatek Crossbow w/ MX-2 paste
Fans: Coolermaster Blue LED 120mm Fans X2
OD:LG Black optical drive
HD: Seagate Barracuda 500GB

would a Corsair 550W be enough for this?

and should i go for home premium or home basic? any large difference?

550 will be fine.
if you are going vista go HP.

are there any performance deference between the Home premium and home basic? reason i ask is it's only special order and i dont wanna wait 1-2 weeks extra.

I say a 550W is a bit tight especially if you plan on hooking more stuff to the computer. (Water cooling, fans etc...) Oh and if you are planing on overclocking.

home basic doesn't have all the proper features and is a crippled OS compared to Premium.

even overclocking the 550 would be plenty, nothing in that system is power demanding.

alright guys. i made a mistake in my first post. I chose the P5Q pro and the PSU is Corsair TX550W, everything is still fine right? already ordered the parts.

The Psu is fine and great board i got the P5Q-E same as yers just addition of bios chip and extra ethernet controller. You'll be fine.

Looks good. Change the PSU to a Corsair 620HX, and the hard drive to a 620GB platter one, preferably the Western Digital Black Series if you want more speed.

The 550 is enough and the speed difference in hdds will be neglible.