Suggest me a dual MOBO for audio recording

Hi

I want to get a dual mobo for my recording workstation, but don't know where to start.

I currently have a raid HD setup, so it needs to support that, it needs to be overclockable, have room for at least 5 pci cards, prefer at least 1.5gig ram, have a fast FSB (800+?), basically be really fast so it can handle large recording projects with ease.

THANKS!

Midge