Point one isnt very valid too. Performance isnt as much as GTS 250 and anyway we always recommend good PSU's to buyers, so no worries.
Anyway, at that price (7.4k), I'd rather buy the GTS 250 than the 4770! Performance matters to me. At a price of say, 6-6.5k, that GFX card would be out of stock everywhere, but not now.