I am looking for a great sub to compliment an Axiom system (M60, VP150, QS8)in the $800-1,200 range. I want a sub setup that is a beast for home theatre yet remains respectable for music listening.

Recently, I have been eyeing these subs:
- ACI Titan II LE
- SVS (built-in amp, various models)

First, I would like to know if anybody has ever listened to the ACI Titan II? If so, what are your thoughts? Anybody researched this sub at all?

Secondly, I would appreciate a little help as to what SVS setup to consider. I require a powered sub and would probably prefer a built-in amp. Aside from that I don't know if I should consider a box or cylinder type? Aesthetically, I could live with either type...space and looks really are not an issue.....I just want the best possible sound experience for my money. I am even open to the possibility of a dual SVS setup (16-46PC for example)unless that would lead to overkill. I am currently in a moderate-sized room but am looking at houses currently...so that is likely change.

Any input, comments, and suggestions would be greatly appreciated. Thanks.