I have tried a pair of Gershman (RX-20 borrow from a friend) in my small living room. They sounded quite booming, they have rear ported and the bass go quite deep at 20hz compare to size of the speakers. I moved them to basement, with lots of room they sounded really good. I ended with Maggies 2.6r for the basement system and the living room I got a pair of Duntech Opal front ported they sound really nice, and Duntech have seal box and front ported design make the speakers quite easy to set up in any rooms and the bass seem always right. Check out my living system pictures, my room is a bit smaller than your room and also check out these Duntech at http://www.duntech.com.au/images/all.html
They cost around 3k to bring over from Aus. but really worth every penny.
Good luck.
They cost around 3k to bring over from Aus. but really worth every penny.
Good luck.