I know this may not seem like the best advice, but if are unable to find a shop with the amps you want to test out. You might want to give youtube a shot. There are a few reviews on behringer and line 6 amps. If you have good speakers or even headphones you may be able to hear what appeals to you.
I'll give that a try. That's what i did before getting my ME-50B actually, seemed to be a pretty decent way of doing things.
Thanks!