I have always bought keyboards that have audio inputs so I can send a mixer signal right TO the on board speakers. I have a 4 channel stereo mixer that combines my laptop audio out(mp3 & midi), my harmonizer, a guest mic and a dedicated out from the drums (when I need it).

This allows me to monitor all signals from the kb. I have my midi files loaded into folders that I keep up on the screen, and the VanBasco player does a nice job with these. The audio files are also in folders(40's, 50's etc ...)and winamp plays them very well. I can simply scroll to a title, and hit the enter key to play any file.
The midi files are being played by the sound card using Roland's Virtual Sound Canvas software, and they sound almost as good as if they came from a keyboard engine. For high demand sound .... I use a midi interface from the laptop into the Korg for better drums and brass parts.

I strongly advise any of you that are tied to lyric sheets to force yourselves to learn the words. It is SO important to have a comfort zone with the lyric before you can fully deliver the message. Reading is a habit, and it CAN be broken. You remember lots of other stuff ..... try learning the words to the stuff you do the most. A true professional show should not have the performer's eyes in a book. (That's for recording or practice.) When it's show time ..... Put on a show.
Once you learn the words, you can start to understand the lyric ... not before. You need all your attention to fully make it your own.