You will miss the clarity of your speakers if you do the trade. I would just go with a small powered sub. I use a small sub with my B&W 805s two channel setup. It adds just enough bass to make me happy on Jazz and small groups.. I usually turn it off for rock! (apt life)
I have Canton speakers for my 5.1 system, and the CLARITY of the sound is the most noticable important thing with those speakers too.
I have Canton speakers for my 5.1 system, and the CLARITY of the sound is the most noticable important thing with those speakers too.

