I want to be able to utilize PhysX if possible and run games like skyrim with emb mods and heavily modded in its self plus bf 4 when it comes out i have $ 750 to spend on it i was thinking on two Gtx 770 or one 780 or even thinking two asus 280x but i was not sure and would like anyone's opinion on the matter i was more thinking the two 770s to run one as a dedicated physX when needed