I was planning on building a new system when Intel released its 6 core CPUs but have decided that I can probably get a fair bit more life out of current system for the moment with a couple of upgrades and a bit of overclocking. I was thinking about upgrading to 4gb of RAM (2x2gb sticks, I have another system the 2x1gb sticks I currently use can go in), installing Windows 7 Pro (so I can actually use the RAM fully) and swapping my SLI 8800GTX's for a single Radeon 5870. My budget is around £550 all told. So I'm looking for opinions on my choices or alternative buys. Cheers all.