The Tenor Guitar is a good choice. It has 4 strings rather than 6 giving it quite a different & IMHO more interesting sound than a standard Guitar, many chords only require 2 fingers, and you stand out from the crowd. It's also undergoing a revival at the moment.

In the UK the Ozark Tenor Guitar sells for £175 and is really nice (I've got one), there's also the Ashbury which is a similar price and looks to be good though I've not tried it.