Advice on a system

Hello all,
Well I will get this PC after few weeks as I hope and I will try to replace some of the parts to be better for gaming but I need your advice on all the parts in general.


Intel Core 2 Duo E7400 2.8 GHz Dual-core 3MB L2 Cache Processor

http://www.advantionline.com/Intel [...] essor.html

ASUS P5N73-AM NVIDIA GeForce 7050 Motherboard

http://www.advantionline.com/ASUS- [...] board.html

Mushkin 3GB

http://www.advantionline.com/Mushk [...] ition.html

It was mentioned in the site by 4 GB but in the PC its written 3 :S

350 Watt Power Supply
duno which brand

here are the important things in the PC, and the things that I want to change are:
Adding new Graphic card
Sapphire ATI Radeon HD 4870 1 GB GDDR5 Dual DVI/HDMI/TV-Out (PCI-Express)

http://www.advantionline.com/Sapph [...] press.html

and
changing the power supply with
Cooler Master 600 Watt eXtreme Power


http://www.advantionline.com/Coole [...] ranty.html

so what you guys think ?
should I change the other parts or this is enough ?

Don't use that motherboard. If you must use this site, then get the G31 board for the same price.

None of the lower wattage Cooler Master power supplies they list are very good.

I see they build the system you order for free, which is nice, but perhaps you should check with a local shop and see what they will build for you and how much it would cost.

This site claims to have very high quality parts but I'm not seeing it.

Yep. I know I helped someone else in Bahrain a few months ago and we got something together that I was satisfied with, but he may have had a larger budget.

The board you picked supports DDR2 800, and you've picked a higher voltage DDR2 1066. It may work, but it will downclock. You may want to look at some DDR2 800.