If you really want to throw extra money away, sure. Practically speaking, you'll essentially get the same results with a $300 card, as well.
Mind you, nobody argues that it's the best card there is right now. It's just that it's overkill for most people (and by most I mean all people

). Do I want one? Hell yes!
But if I had $500 I'd spend $300 or so on a Ge7800/7900 and pocket the other $200.
So, long story short: Yes, that card. If you want it.