Looking to give my 4 year old PC a spec boost and wondering what would be a good bang for my buck. Current spec is... Win 7 x64 CPU - Intel Core 2 Quad Q6600 @ 2.4ghz RAM - 4 GB Dual channel DDR2 @ 533mhz MOBO - Gigabyte Technology EP43-DS3L (socket 775) Graphics - ATI Radeon HD 4600 (with a Dell U2410 @ 1920x1200) unsure of the ram on board - poss 512mb HDD - Seagate ST3500320AS (8mb cache, 7200rpm) I mainly use it for web surfing, iTunes/iPhone, Photoshop and CAD and it's the latter that could do with a good kick - my understanding is that AutoCAD prefer's nVidia cards but for some reason I also feel that my MS intellimouse explorer 3 mouse also makes it feel a little disjointed... Current thinking is to bump the RAM up to 8GB by swapping my current DIMM's for 2x 4gb - although am I limited to DDR2 (supported by the Mobo) or can I get DDR3? (which is a hell of a lot cheaper!) I don't want to started swapping the Mobo / CPU. Also thinking of getting a BR drive and a 2nd large HDD as the current drive is getting on a bit. Any suggestions welcome.