I think you'd be better off spending a little bit more on the motherboard say £130ish then buying memory to suit the motherboard from Crucial. I presume the graphics card is PCI Express do you want Crossfire so you can later put a second graphics card in? I bought 2 matched 512mb PC3200 from Crucial for £70. Do you want SATA for the hard drives? You'll need to cut it down a bit to help people recommend.