Well, considering your situation, I would then consider what is the best you can get with the current offerings that the current market has. However, I strongly recommend you look at both sides of the competition. ATI may have the strongest card when it comes to framerate-crunching performance, but it suffers severely when you put it in a DX11 environment that has tesselation play a heavy role in its rendering compared to the competition.
That's the exact reason why I'm telling you to wait if you're getting an ATI card, or get the GTX 480. It may be a bit more expensive, but at least it won't be crippled when DX11 tesselation becomes more heavily used in future games. You're getting a card to last you for a while, right? Then look to the card that gives the best all-round performance, both in the current DX9/DX10 environments, and the newer DX11 environments. This is pretty much what you're getting from the each competitor:
5870: Great DX9/DX10 performance, weak DX11 performance
GTX 480: Great DX9/DX10 performance, extremely good DX11 performance (by today's standards, that is).
5970: Extremely good DX9/DX10 performance, extremely good DX11 performance (with microstuttering though, as full DX11 rendering tends to bring every card in the market below 40fps. So, not only is it stuttering when rendering DX11 tesselation, it is equal to the cheaper GTX 480 in this area).
If you were to go for the 5870, then I will go ahead and recommend it as well as it is the best performing card in that price bracket (now between 300-400USD). However, if you are looking at the 5970, then you must understand the deficiencies that it has against the competition, and to decide if you are willing to pay the extra money despite those faults.
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