Those are some good choices, however I would recommend a different sub. Internet direct brands offer much more value when it comes to subs, and you can get something nicer for $1600... I would probably recommend a pair of subs, you have a good size room and dual subs will create a more even bass response throughout. I would consider a pair of SVS SB-2000 (to keep it compact like the MA sub), these are very good subs and the pair would sound excellent. They recently added a very nice piano black option and I think it would definitely be worth getting.
Samsung PN60F5300 | Denon DBP-1611 | Roku 3
Denon AVR-1713 | EMP E55Ti | EMP E56Ci | EMP E5Bi | BIC F-12
Topping TP23 | NHT SuperZero 2.0 | Velodyne DEQ-8R