My first build, need a few pointers, gaming PC

I’ve decided to get up a bit of cash and buy myself a pc for gaming. I’m on low on funds, so I’m trying to get the best bang for my buck.

I live in the UK so pc components cost more. I’ve heard good things about the following websites, dabs.com scan.co.uk and overclockers.co.uk. So I’ll more in likely buy from these trustworthy sources unless told otherwise.

I’ve been looking around and doing a bit of research and have came up with the following system.

Motherboard: Asustek A8N-E S939 nForce4 Ultra ATX
CPU: AMD Athlon 64 3500+ Socket 939 512KB Inc. Fan
Memory: Crucial 1GB 184pin DIMM PC3200 DDRRAM NP Unbuffered CL3.0
GPU: XFX GeForce 7900GT 256MB DDR3 PCIE Dual DVI
Case and PSU: DabsValue Midi Tower 400W Black

I'd like the community to have a look at this setup and tell me what they think, I’ll be putting this together only them components, and not overclocking until I get more money.

Make what ever comment you wish , A few queries I have….
I’m I missing anything. I have a few components form my old computer that will make this a complete computer, like cooling fans, monitor, keyboard, mouse, DVD and speakers.

Is this all compatible, will this all fit together and work?

Any better components I could buy around the same price?

What will game performance be like?

Whats the overclockability like ?

I’ll edit this if I think of more questions.

If at all possible, I would try and hold out for the Conroe to be released (end of the month I'm hearing)

Also, try not to skimp out on a Power Supply.

Beyond that, looks good, I'm sure you wouldn't be dissappointed in the performance.

As for overclockability? I don't know, I haven't overclocked since the days of the Barton

I agree completely with Mesa and prozac, Conroe would be a much better option. But if you simply can't wait for a Conroe, or it doesn't fit within your budget, at least wait until Conroe comes out so you can take advantage of the price cuts AMD has planned.