Need help finding new graphics card.

[Rocket Propelled Rocket]

Oh hey guise, I'm back. Anyways, straight to the point now.

Turns out my father's computer is pretty advanced and can run most games, even for a standard computer. Thing is, it's graphics card is a little outdated. So, my question is.. What's a good, powerful graphics card that can, say, run Battlefield 3 on at least recommended settings, but won't cost me an arm or a leg? It'll only have to last around two years, since I'll be deployed after then and won't be able to take it with me. Thank you everyone ahead of time for searching.

[xzx]

Not many choices in size.
You have the newest 2gb or the older 1gb.
Then half that and half that etc.

My guess would be go for a 1gb or if you're strapped you'll just need to find a 586mb, if that even works. Haha....

Here's what it says is recommended but I don't know about this kind of specs; NVIDIA GeForce GTX 560 or AMD Radeon HD 6950