leroy what do you want to spend? there are plenty of options available. I usually go for geforce card but after doing the benchmarks and what not when i built mine a few months ago the ATI cards where light years ahead so opted for the 7970 x 2 (7990 had just came out) can be over clocked if required
that being said the GTX 680s are awesome aswell tho seem to be still exy for what they are.