i'd look for one of the high-end single-driver based speakers, as they're efficient as hell, easy to amplify, and don't have a seperate tweeter to extend to the high extremes. plus, there are many who believe that the single-driver speaker is the most sonically accurate, since it uses no crossovers. i've only heard a few, and they were all sonically amazing. check out the speakers on tis website, as they're the best single-drivers i've ever heard.
www.rethm.com
or you could treat the room and buy whatever you want.
good luck, man!