If your looking for a small (about car battery size), loud, built in effects and battery powered along with ac adaptor Amp to take to the beach or mountains let me remind you of the Roland MicroCube. This is a wonderful little box with all the sounds you would need combined into a very small package. I was just blown away by the sound that comes from this 2 watt 5 inch speaker little wonder. Seems to be built like a tank! http://launch.groups.yahoo.com/group/Roland_Microcube has some pictures and more information.
later dayz