ULTRASOUND AMPS !!
These are the amps you have been reading about -- the make a 30 watt acoustic amp that has a huge sound and a small price --- visit the ultrasound website for model specs.
The other popular amp is the Jazz combo -- the 50 watt model with two 8" speakers is available with spring or digital effects ! They also make a 100 watt version that has 4 x 8" speakers.