fritz7 :
My 1st guess would be the 570, but I guess let's just wait until someone who has had both/and/or one of the cards can give us more information.
That would be me (well, actually a 480 and 580, but close enough). When I owned my GTX 480, I used to defend the noise levels as not being all that bad, and it's true they aren't to the point of being intolerable. But I didn't hesitate to get a GTX 580 when they came out, just to get a quieter video card. The difference is significant. The 580 (570) has a more "normal" sound level, while the 480 is more noticeable.
At $200 the GTX 480 is a good deal, but there is the noise issue. Some would suggest you get an aftermarket cooler and install that onto the 480. I would recommend a GTX 570 as being essentially the same thing; you spend a little more and get a quieter card with essentially the same performance. The two 570's I listed actually do have aftermarket coolers on them. If $200 is the budget, then get the GTX 480.
fritz7 :
http://www.hwcompare.com/9000/geforce-gtx-480-vs-geforce-gtx-570/
Not sure how useful this link is, though.
For those hwcompare.com reports, they only list theoretical performance on reference cards. It's hardly an accurate representation of real-world performance.
Tom's Hardware has a complete database of actual performance benchmarks:
http://www.tomshardware.com/charts/2012-vga-gpgpu/benchmarks,135.html
So does Guru3d:
http://www.guru3d.com/article/vga-charts-summer-2012/