Any thoughts of X3 710 DDR2 vs. X3 720 DDR3? Should I get the higher end of these 2? Is that much real world difference? How would the GPU help out, would there be not much difference? I do plan to OC the CPU.
No there isn't much performance difference. The deciding factor is really whether you want to upgrade your system after a while, if you want to then go for DDR3, otherwise it wouldn't hurt to pick DDR2. Take the 720 over the 710 (just making sure you know they both support DDR3 in a AM3 motherboard and DDR2 in an AM2+ one).