Mapman - Boa2 had his Khorns in a relatively small room and they sounded great there. I'd say the really difficult aspect of using the room you describe is the square ratio which is one of the worst proportions for a good listening room. You may have to address that with room treatment no matter what speakers you put in there (assuming you have not already). You can search the archives as I think this has come up before in various threads.
I think you need to consider some of the other excellent offerings from Klipsch that use woofers for the lows.
All the ones mentioned here do use woofers for the lows. I think what you meant was forward firing woofers, as opposed to woofers used within a folded horn. In the Klipsch Heritage line the forward firing options are limited to the Cornwall and Heresy. The latter is not a bad little speaker either, but you wouldn't be getting a full dose of horn magic IMO, and the bass response is quite limited as well. The Forte and Chorus also have forward firing woofers (as well as a passive rear-firing woofer in the back). Again, nice speakers (more for rockin' IMO), and there you would get all the bass you'll need, but if you want a full heaping helping of Klipsch horn magic, my recommendation would be the larger horns in the Heritage line (Khorn, LaScala, Belle).
Marco