Oh, that's an *eye*, not an *ell*. >_>
Ultimately, it depends on the card, I guess. Generally speaking, though, there's always a premium on flagship models.
Right now, with the ATi 5000-series cards, there's a bit of a gap between ~170$ and ~350$, but there's a rumoured card launching in like two weeks that'll fall right between the two, which would probably be what you're after in that case. There are other older options, but I'd personally go for the newest stuff, so that you get DX11 support and what not.