Howyadoin,
I've got a P4PE (not BP) in my DAW, and it's been great except that the first one I got was bad out-of-box, which sucked rather heavily

I stripped the BIOS of all the onboard peripherals except the sound and 10/100 NIC, and it's really solid running XP and Cubase SX with the Delta 1010.
If you want to build a dedicated DAW box, I'd recommend the Intel 845PESV motherboard. Onboard 10/100, SoundMAX audio, USB and that's about it. Same chipset as the P4PE.
Some of the ASUS stuff is weird, like that goofy onboard Molex connector for the extra 12VDC input and programmable voice prompts for POST. Also be advised that there is a lingering but sporadic issue linked to ASUS's temperature monitoring diodes that causes hangups at cold boot. I haven't seen this myself, but there are quite a few reports on the ASUS fanboy sites.
I like ASUS products a lot; the K7V that ran my Athlon 750 was the most solid Win98 system I've ever seen. The A7V and A7V133 on the other hand, I know a lot of people that cursed those boards
I'm sure you'll be happy with the P4PE-BP, it's a nice, versatile motherboard.