John,
You could amplify so many different ways bro, but I would just keep it simple in your case, retain your desired tone if not hone it out even better, and also be fully expandable to any degree. They are a little pricey, but I would get a Roland keyboard amp.
Now, I'm not a lover of all Roland gear, But, I doubt there is a person on this board that could righteously bash on the performance of a Roland keyboard amp (with the exception, including me, of whining about the darn price of 'em) The little bit more though, guaranteed, will never wind up as wasted money.
.
Pete
_________________________
MORPH! Sound