My calculations project leveling at ~1.2-1.5 B difficulty sometime Dec/Jan.  It will flatten until the ASIC gen2s hit the market mid-2014, but the impact of those will be incremental, not dramatic as we have seen when the technology has lept from CPU to GPU to FGPA to ASIC. 

Call me crazy now, but mark this post and call me a prophet in Jan/Feb when the leveling is proven.