I agree with everyone else that the Gainward Ti500 cards are totally awesome.However I would consider the Leadtek Ti500's more seriously. Here's my reasoning:
The Leadtek Ti500 cards are supposed to have top notch 2D quality. So good in fact, that FiringSquad.com had the following to say about the Leadtek Ti500:
During our tests with a Matrox G450, G550, ATI Radeon VE, Radeon All-in-Wonder, the WinFast Ti 500 showed better image consistency than any other card.
Not only that, but Leadtek cards always outperform other cards bundled around the same GPU! You'd think that to be pretty crazy, I mean why would a Ti500 from Leadtek perform any better than a Ti500 from Gainward. To tell you the truth, I'm not 100% sure why, but I am sure that if you look at the benchmarks you'll see that Leadtek has always stood out as a leader in performance.
Therefore, I'd say go with Leadtek.