subs for music

I currently have ML Aeons set up in a 10x12 room. The rest of the chain includes a Rogue Stereo 90, Rogue 66 Magnum, CJ EV1 phono, VPI Scoutmaster w/ ring clamp and Benz Micro Glider HO, McIntosh MCD205, and Denon DVD2900. I work in an AV store, and have access to a lot of subs, but they are all set up with HT processors, and none of the speakers we carry are as fast as stats. I have noticed that my system doesn't give me super deep bass (I of course knew that when I built it up, but now think a little more bass might help the sound). Does anyone use a sub for 2 channel music? What would be a good match with the Logans if I were to decide to pick up a sub? How well do subs integrate in 2 channel setups for music?

These may seem like dumb questions, but I had once heard that a sub isn't really a good idea for 2 channel, but now I am wondering if I'm not missing out. I can get a good deal on the Infinity CSW10 right now, and it is one sub I am considering. (Also looking at DefTech SuperCube, and all the Logan subs) But should I only look at Logan subs because of the speed of the stats? I don't want any coherence issues to crop up if I add a sub.