Are you truly going to be using onboard firewire wolf? If that's the only reason you need I say look into a PCI card and choose any board you like.
But if your still persistent, the P5K-e I would trust more. I've heard of a few problems with GB's P35 line.
Those problems only exist on the P35 DS3L boards, something about them just doesnt work right (or guys realise how popular these boards are. If so many people buy them odd problems will occur more frequently). Anyway either choices are good at the moment, but
dont expect to recieve a board that will clock at 500FSB+. Intel has evidently stopped shipping such crazy clocking P35 chips...
Please note, the P5K-E focuses on the features enthusiasts usually forget about-the audio, and the NIC. The P5K-E has a poor onboard marvell yukon gigabit NIC.... I doubt it can really do one gigabit, same story applies for the onboard audio solution,compared to the EP35 DS3P. The EP35 DS3P is a more "quality" board overall, with all the features being relatively good.
EDIT: P5K-E? WTF? Err no way. Go for the EP35 DS3P. Why? The P5K-E has a rather poor NB cooler, at the same price the EP35 DS3P wins hands down.