At the moment I have a amd 7850 BE with 2gb ddr2 ram and a 320mb 8800gts. I was thinking about buying a whole new system but talked myself out of that to save money. Also have 60gb ssd to fit in too.

The motherboard is an asrock n68-s so I'll find the fastest quad core phenom 2 that it'll take and buy 2x2gb ddr2 sticks, unless I happen to find 2x4gb sticks that don't cost a fortune.

Now I'm not sure what graphics card to get. My original plan was for a 660ti but I'm wondering if it'll be overkill for the rest of the system? Should I stick to this or go for a cheaper card such as a 650ti or ati 77xx/78xx???