Looking for a good deal on a 600 WATT PSU, preferebly a quiet one?
Seasonic G 550. You don't need a 600W PSU, if you're only powering a single GPU. You don't even need a 450, let alone a 550, at that. G 550 is really nice, though. High efficiency, low ripple, tight all around. great unit.
Seasonic is a great brand.
You posted that 23 seconds before I posted my Seasonic recommendation. Great minds, I guess.