the nVidia GTX 660, and GTX 670Ti are also coming out soon but I'm not sure of exact date.
the HD 7850 but I like the HD 7870 more is of course out now.
I would not count on GTX600 series at all. I mean come one. What are they sending 1 card at a time? ... Gee those dies must have horrible horrible yields...Don't get me wrong reviews are awesome but if you can't buy them they are as good as nothing just makes us salivate that is all...
Get 7850 it is great a ovrclocker if done right it can push as much HP as 580. For $220 you can't beat that.
Another thing is don't get stuck with that card...have it for few months sell it ...save some $$$ and get something faster if
Once you start rolling you will switch cards left and right just test them and sell them ...That is what I do when I'm bored lol