Hey guys my cousin recently asked me to help him build a computer for basic school work and he wants to play some games. I know for sure the main game he wants to play is League of Legend. His current budget is about 700 dollars and he is going to be using a 19 inch monitor.
I couldn't decide on the specific 6850 and I didn't touch the Case & PSU.
Hopefully you could unlock this CPU to a Quad.
Overall at this price this is what I'd do, you may do as you wish but I thought I'd give you an alternative.