Metro and AvP are DX11....
In fact have you compared AvP in DX9 vs DX11? Yet again night and day
Its very simple and you wont be spending much if you sell the cards you have and put the money towards a newer DX11 card.
Ask a friend or something to show you. You wont be disapointed with a DX11 card.
Im a hardore gamer too and usually if I can afford it I like to stay in sync with current gen cards. like if I play AvP or BC2 with an older card knowing im missing out on feature I have the itchy trigger upgrade finger