What is your budget? After that, we can talk
I personally would stay away from Klipsch, Just not good in the lower freq.
You obviously wont need a big sub for 1500 Cubic Feet of room to fill.
If you want something that will do a great job of giving you QUALITY low bass, I would go with these:
If you have a low budget <$250, the clear winner so far is the Bic H-100
If its around $300-$400, Check out Outlaw's LFM-1 Compact, HSU VTF-1/STF-2.