Get a middle of the line past generation/ early current generation AMD video card. Like the 6670, since the APU and GPU would then be using similar architecture (Turk cores). This would allow for a more efficient "Hybrid CFX". This doesn't mean you will get huge performance boosts, but you will likely see better performance in most games. Make sure whatever GPU you do get, make sure to get one that uses DDR3 Vram, as the DDR5 Vram from later cards will not sync. This could hinder performance. And as earlier posts stated, and APU is by no means a way of cutting costs on a gaming pc. You will not have good performance at high resolutions. Simply enough, buy an independent GPU, and buy a Phenom II processor, you will gain a large amount of performance over Hybrid CFX. It will also be less taxing on your system.
If you need any more help, PM me.
Edit: ^+1, please delete your email, especially if it is a work address.