Look at the new Fishman Artists series which are fantastic. They make one that I think is just in your budget.

Or, look at an older used Fishman amp for a very reduced price to meet your budget. Buy at Musicians Friend or Guitar Center so you have at least a temporary warranty.

In my opinion, Fishman amps are the best sounding and the most transparent, and have some effects, and you can add whatever you want in the signal chain.

Best wishes.