I was going to recommend the ACI Titan XL at 1000$, however the room may be a bit too large. At 1700$, the ACI Maestro XL would be a good choice. These are the satin black versions and are on sale at audioc.com
I have had great luck with both the Titan and maestro for excellent quality bass, excellent customer service, etc.
With that said, there are the typical suggestions of HSU HO with the Turbo, the SVS PB-12 Plus, Dual MFW-15 subwoofers from av123 (I see May availability), eD A7S-450, epik Tower.
If you have any questions, you can contact any of these manufactures and they will answer your questions.