Did you get a chance to watch the DerBaur video where he goes into the changes in BIOS?
the new setting are definitely worth the extra $70.
It allows you to set your load limit per CCX for Multi-core overclocking yet still retain the ability to boost single threaded using the built in boosting. It's a really great feature and it's the only board which can do that (for now, anyway)
You get the best of the single core overclocks and the best multi-core overclocks as well...
I wonder if Asus will release an updated BIOS for their top of the line Crosshair Formula board to support this feature as well, assuming there are no additional hardware requirements.