@Fishwithadeagle I don't really understand your argument. Saying it's a "high-end mid range" card or a "low-end high end" card is a completely artificial division that you have come up with in your head. It doesn't effect anything. Perhaps you meant a high-end Pitcairn based card vs. a low-end Tahiti based card, which would have made more sense, but either way what matters is that the 7870 XT is (significantly given the small price difference) faster than the 7870 in gaming, while being comfortably within the OP's price range. Whether or not you classify it as a "mid-low high end whatever" is irrelevant.
Secondly I don't see any information to backup the claim that it will have a shorter life-span. Surely the low-end Pitcairn/Tahiti cards (the 7850/7870 XT) should have longer lifespans then their high-end equivalents (the 7870/7970) since the lower end ones have slower clocks, and lower voltages, which (by common sense) would lead to a longer lifespan. Anyway this is completely irrelevant, since any card from a decent manufacturer will have a fairly long warranty anyway. Not that you should expect any card to have a lifetime less than it's warranty (it wouldn't be good business for the manufacturers), but I think it shows that they have confidence that their products will last for some time (and against popular belief, 99% of the time you do not know more about the electrical engineers who designed the card themselves).
People on Newegg aren't exactly your "unbiased reviewer". You can always find negative reviews on Newegg, since no manufacturer can ensure that every single unit is going to be fault free and not DoA. I agree that the 7870 XT does have a slightly higher power draw, but it's still nothing that a standard PSU can't handle. More power equates to more heat, that's a fact, and I haven't seen any convincing proof that this heat is "too much" for the cooler by any means or any information to back up your claim that "it won't have as long of a lifespan".
At the end of the day, for the same amount of money (or just a little more) I'd rather have the graphics card with the better architecture and the superior gaming performance, wouldn't you? The fact that it's maybe 5C hotter and draws 30 more watts under load, is of really of no concern to me, given that it's still going to be way below the recommended maximum. It games better, and that's what people notice and care about.
All the best,
M