The WEI is absolutely worthless.
The performance difference between the 570 and 580 is very small. BFTB-wise, the 570 is the better option.
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As I said if you can wait another month or two there will be a whole new generation of GTX 700 series available. This means that current products are likely to go on sale and/or you can get more capability for current prices.
I agree, Harm. The WEI, for the most part, is only good for separating the obviously substandard from the barely tolerable. It is absolutely useless for comparing systems that are both reasonably fast (but one is obviously noticeably faster than the other).
On the other hand, if the OP absolutely must get a new card right away, he should go for the GTX 570 since the GTX 580's performance increase isn't worth the extra $150 or so over the GTX 570. But make sure that he gets a true reference GTX 570 if he must purchase an eVGA-branded card since the so-called "GTX 570 HD" cards from that same company are significantly shorter and come with less effective coolers that are very similar to the reference GTX 560 Ti heatsink (plus, the "GTX 570 HD" cards are based on PCBs that are only as long as a reference GTX 560 Ti board).
Thanks. Since I have to wait till July, I'll revisit this question then, in light of the new cards coming out.