Radeon 7850 overclocked edition or GTX 570 superclocked

The super clocked GTX 570 is faster but the HD 7850 can be easily overclocked to beat it.
If I were you I would get GTX 570 only if only its as the same price as the 7850 else I would go for the 7850 (much lower power/overclock-ability)

are you worried about power consumption.?
the GTX 570 is better in performance, both cards can still be overclocked with programs like MSi Afterburner.
the HD 7850 is more power efficient.

if you have the ample power supply and the pennies it costs more to run the GTX 570 doesn't bother you.
(and I did say pennies more a month)
I'd go with the 570 but it's a preference I have.

look for benches in the games you run and resolution in particular..!
with that being said, when does the GTX 660 and GTX 660-Ti release.?