My wife and I do a similar thing - I play keyboards/sing - my wife is the main vocalist...I use a SONY cd/dvd player to play my MP3 BIAB tracks live - works great - nice sized screen that shows full song titles - so I can scroll to any tune I want...and don't have to worry about a laptop crashing or whatever....just carry a spare CD player in case.

Using 2 JBL EON 10s and a Mackie mixer with a BBE sonic mazimizer - and everything runs thu the Mackie...
Pretty decent overall sound, although an upgrade from '08 to '10 w/real tracks would make a HUGE improvement in the quality of the tracks.... have a listen to us at www.angelfire.com/ny5/dodi_dennis/sounds.html .

Hope this helps....