I think GTX 470 will probably rather be 349 - $399 and be around HD 5870 performance levels or slightly behind depending on game and GTX 480 499 - $549 with around 20~25% lead over HD5870 in avg and up to 40~50% or so in tesselation heavy benchmarks. Would love to be wrong but I can see this coming by now. Really looks like NVIDIA failed even more this round despite this was supposed to be a huge step up from last gen. Sure it's got its specific strong points but in pure gaming performance it's probably not really that convincing, if all games were using as much tesselation as Unigine Heaven benchmark it would compete very decently but unfortunately that's not gonna happen during the time ATI has time to counter NVIDIA.
Knowing NVIDIA and looking at what kinda chips and strategy NV choose it's quite obvious the OP mentioned figures are slightly on the optimistic side. NVIDIA has expensive chips that needs to be sold as high as possible at launch, it usually charges like 5% more than ATI would because there's still people buying and since there's lots of greenboy fans around still and to try and keep ATI from lowering the prices to very low levels after a while which forces NVIDIA to sell the cards with very little to no profit at all. Better start with as high prices as possible, below $349 for a GTX 470 and $499 for a GTX 480 sounds very unlikely. At least if there's still some sense over at that company. ^^
I remember the very optimistic speculations some months ago incl me of GTX 480 performing like 50~70% better than HD 5870 and very close to HD 5890 levels, seems like that was nothing more than a very silly dream. ^^
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