IMO, it is about what you are going to do in the future. Are you building this computer for 'now' and build a totally new one in the future? Or are you building a computer now to upgrade later?
If you are building a computer for 'now', then go for the 9600 and save the remainder.
If you are building to upgrade later, then decide if you rather crossfire or sli, then decide on a mother board.
If crossfire, then the 3870's are in order or in a few weeks I think, the 4800 will be in order. If sli, then 8800 gt right on up will be the way to go.
So it depends on you and what you want to do, combined with your budget now and in the future.