The mother boards are never just all good. People have had issues with the base p8p67. Some people find the Gigabyte UD4 buggy. Some people don't like the fact that the Giga boards don't have a UEFI bios (graphical interface bios with mouse support). There is a Sabretooth 4 phase as well as an MSI 4 phase mobo that you should avoid as that's not really going to keep your 5Ghz overclock solid for years to come. Also You need to consider whether 16 total PCIE lanes is enough for you. I'd get a board with the NF200 chip. Even though it's a bit laggy and isn't a huge improvement, it does give you additional lanes, even if they're slightly gimpy, and that's good for, say, your massive amount of SSD drives not hogging up too many PCIE lanes, or say you want to run 2 GPUs and a Revodrive and a 2.5" SSD etc..
Traditionally P67, at the chipset level, does 16 total lanes meaning 2 graphics cards will run 8/8 default. A lot of other things eat PCIE bandwidth too, like extra SATA and USB3 controllers, etc.
It's only an issue to consider for the power user who wants to have 2 GPUs+.
