Dan,

My main keyboard is Roland G1000 (no speakers), which I play most of the time with the YST-MS50s at half-volume at most - the internal speakers would do nicely to replace them for practice or personal monitoring.

For my smaller gigs I take my Roland E-70, which has I believe 30 watts of internal amplification (woofer in the bottom, plus two speakers on the sides).

I wish that there were a professional (Sorry Casio) manufacturer with 76 keys and speakers in a single instrument.

Yesterday I was playing a very fancy private party (with the MS50s). Towards the end of my playing they had asked me to accompany someone, so I had to move from where I was standing to the stage. I had to move the keyboard with the stand, and separately the speakers (two trips). Had I been using a digital slab piano with speakers, and a laptop, it would have been the same number of trips for me. Ideally, though, someone will make a good 76-key board with speakers and the high-end arranger functions built in.

Regards,
Alex