My friend uses an APU and he bought a GTX 660, the're pretty cheap and if you can pick up a Zotac 660 AMP! you'll be set for a while, the 660 alone can out power some AMD 270X's and their $100-$200 CAD more in my area. Granted if you want longer upgrade I think a 760 would suffice as well. Your options are pretty open if the Radeon HD 8760D was basically paired to match a GTX 640. Think about if you'll use what each side offers before you pick one though if you want to use DX encoding or CUDA (Nvidia does DX too but still), and remember that not all PhysX supported games support GPU PhysX.