DarkSable :
Just throwing out there, the "upgrade" from a 650 to a 660 isn't going to be very noticeable - I'd look at a 660ti or better.
650 1gb, 650 2gb, 650 sc and ssc editions. then the 650 Ti, 650 Ti 2gb, 650 Ti SSC 2gb. then the 660.
It will be a difference for some of the games I play.