This sounds like one way cool board - I'm definitely getting one (sid tunes! woohoo!), and I might even get an A4000 keyboard for the 'complete' amiga feel :-D (my current Amy is an A1200, so I can't exactly use *it's* keyboard).
Edit: Hmmm, I wonder if the attached keyboard will behave exactly like an AT keyboard (as in pressing 'Del' to enter the BIOS setup), or if it will need drivers?