What resolution will you be gaming at?
Im on 1920x1080, and my Radeon 6950 is awesome, and i'd recommend it.
However, with the next series of cards rolling out for both nvidia and ATI, you might want to spend the extra cash and get a nice new card.
I'm also 1920 x 1080 on a 42" LED. I'm planning on getting a 7870 once my tax refund comes in.
The 7850 will probably be a better bet as the 6950 is in the process of being discontinued