Hey Dan,
Nice little set up there.
If you need a good sub on the cheap. I'm looking to get rid of my TSC - ASW-10 for 75.00. It's a clean sounding sub that would work well in your office. Might even work well in your living room.
Audioholics did a review of the ASW-8 with some of TSC's satellite speakers if you wanted to investigate how there subs perform. The ASW 10 will go lower (28hz) and play a good bit louder though.
Let me know if your interested and we can set up a meet and do a demo for you.
Cheers,
Glenn