Not sure mate, I've never owned an XFX board. The last Nvidia chipset I used was back in 2003 on my AMD system.

Price wise, the P5Q-premium is the flagship P45 board, but it would be nice to see Asus do a better job of their BIOSes.

Gigabytes current boards (EP45-Extreme & UD3P) have great BIOS & a full suite of relevant BIOS options designed for the overclocker, and are undergoing constant development. DFI is also doing a very good job of this, and the sheer number of their BIOS options are second to none.