I cannot in good conscience recommend Emo to anyone. They apparently have some new Subs coming out, and a review is promised here at AH, but still.... I would wait for that review if you are in any way considering that seriously.
If there were a way for you to upgrade to two Mono 12", you would likely be stoked. The 15" is a beast for certain and will be quite impressive on its own... and own that room if ever you were to step up to duals.
That said, Hsu VTF3 or VTF 15s would also potentially be a good look, especially as duals. The benefit with them is their cost is very affordable and they can hang with some of the best. Never heard a bad word about them.