Looks like a gaming rig to me. I'd go for the E7200 and take the Antec Solo instead of your current case choice. For the hard-drive my favourite is the WD640AAKS. Another advice would be a quiet replacement fan for the Xigmatek heatsink, it can be quite noisy. For a couple of extra quid, a AC Accelero S1 rev2 will allow for better graphics card cooling. Strap a slow fan on it and you're on the save side with the new HD4850. You can also drop one notch in the power supply and go with a VX450 or similar.