Yamaha DTXpress/DTXplorer/DTXtreme

Hi folks!

Really enjoying all the postings here - great information!  

I was wondering if anybody has any recommendations on what kind of amp to use
for this set?  I am currently running mine thru my brother-in-laws Fender 
300 Watt PA system, with two 15" speaker cabinets with horns.  They sound great
thru that, but it's a little on the large size for hauling around.  I really 
need something that will work well in a room anywhere from 10 x 12 feet up to 
maybe a 2 car garage.  I was thinking about something around 100-150 watt.. 
might start out with one speaker but would like to be able to expand to a second
if needed.  Nothing professional, just a couple of old guys playing music and
drinking a few beers.

Any suggestions?  What is everybody else using? Keyboard amps, PA systems?
12" speaker big enough, or do you suggest 15"  I'd like to hear what is 
working well for you.

Thanks in advance for the help!

Rolf Baehr
Loveland, CO