I checked the DFI reviews and they're worst.
Anyhow, I've noticed that some people with P5B-Deluxe, can't handle some of the BIOS settings. At first I thought ASUS screwed up with the P5B Deluxe but now? I sure as heck don't regret going for the P5B Deluxe, because I almost went for the P5W-DH Deluxe.
But the best MoBo is the P5B-Deluxe and also the GIGABYTE DS3 which unfortunately I am not experienced on that one but a few people are, it's just that it's a pain to get a hold of 'em from what I can tell.