When should I buy?

[Mutley]

Currently I have this:
AMD64 3800
1gb DDR 3200 (unbranded)
Nvidia 6600 PCIe
A crap motherboard

I really like the look of the Intel Quadros coming out in November I think, from the success of the Duos, they look mean. I need a new graphics card, I have no idea how far away DX10 is. Need more ram, would really like about 3-4gb ...and a new Motherboard. :D

So yeh, I need a new PC, just my question is, when should I start buying? And what? Is it worth waiting for a DX10 or get a DX9 card before?

Any reccomendations? Looking for a mid-high budget, £600? For GPU/CPU/RAM/Mobo. No hard-disk or sound cards etc. :)

[Asus]

If you multitask then look to the multicore CPUs.
If you just run the game and nothing in the background then I'd hold on to what you have a bit longer.

Although a Good gfx card will improve your game a lot more than a CPU update. Not sure if you remember or not but HardOCP benchmarked the Core 2 Duo CPU against the Athlon 64 at high resolutions to remind everyone that things are still GFX bottlenecked. Both CPUs will give you basicly the same framerate at high resolution/detail. Lower the resolution and the better CPU will pull a head. But I don't know anyone with a good sytem that plays at 800x600 rather they play at 1280x1024 or higher with AA/AF. So what I'm saying is upgrade as your budget allows with the GFX as first priority if you have games in mind. You already have PCI-Express so you are free to upgrade the GFX card any time. DX10 would be a good time to do that. If you have money to upgrade the CPU, mobo and RAM then go for it.