Eh, those are pretty good. But if your looking for some real overclocking power and are on a budget try a P5N-E SLI. This is the board I chose and so far it's working out phenomenally. I did a little research and found out exactly what this board can do. So, the world is your oyster.
How is your Q6600 running in it?
In general the 6 series from nVidia don't OC quads well, some do and some don't. It's very hit or miss.
If you want cheap the Blood Iron does well. (From MotherboardPro though, Newegg is overcharging like crazy).
It will hit 3.2 GHz no problem, just don't try to push for 3.6 GHz, I moved to a P5K-E for that and I don't think it can be beat (for the money).