Yamaha DTXpress/DTXplorer/DTXtreme

Steph:

I've played my kit through several amps, all of which would be a good 
choice. They are; Samson KB140, Peavey KB 300, Roland KC500. They are 
all in the 140-150 watt range and have four channels. I went with the 
Samson only because I got a great deal on it.

Don't be tempted to go with any thing less than 150 watts or a 15" 
woofer. You'll be sorry, I'm certain, later on.

For the the $400 bucks you're looking to spend you should be able to 
find any of these used.

Stephen