Again, you're looking into FSB far too much. P35 seems like a very stable and robust chipset and most boards based on it will be able to handle high FSB untill the chip hits it's wall.

So unless you have a chip like OBR/Oskar which has a higher wall than what most boards can provide then there won't be much difference between boards.

The only difference is how well the bios' lets the end user manipulate strap performance, memory clocking. These things will show difference in synthetic benchmarks but for a 24/7 overclocker who uses their desktop for daily things such as game - probably won't.

I believe Oskar must be level better at nForce chipsets than other R&D people at other firms because the LP NF2 Ultra B and the NF3 250GB and the NF4 ranger were all top of their game boards. It seems every motherboard manufacturer is able to put out intel based boards which are good clockers.