i suspect stability at around 120-130. and then a drop, once more and more asic hit the streets. and then a rise to 250-300 right after christmas, once everybody starts seeing theire coin income dry up in the wake of everybody sitting on some kind of asic or another.
I then say it hits 500 for the first time, around juli 2014. just before the next gen asics comes along.
My 2 cents
I predict the next gen asics for 2013. Pretty sure, Team Avalon is already working on a 55nm chip.