If I was buying a keyboard amp today I would first look at the Hartke KM200 and then the Barbetta Sona 32, and lastly a Peavey PR15P (powered speaker). I use a Kustom KMA 100x; it's a light & compact 3-channel amp with FX that is fine for monitoring or small stage work.
http://www.pricegrabber.com/search_getprod.php/masterid=5267482

If you've got the muscles and balls, you can't beat the older Peavey KB300 - it's heavy but raw & solid. I traded the Peavey for a Roland KC500 and was unhappy. I just didn't care for the Roland's tone. After the Peavey, you'd think it would be an improvement, but far from it - for me. I couldn't get my Peavey back and couldn't find another with the XLR on Ch.1, so I've been settling for other setups since.

How about a Mackie SRM450 or a JBL Eon15?

[This message has been edited by cassp (edited 04-12-2007).]