hi John,
I'll break it to you...' music only' sounds great... until you mention dub... that puts you into the heart of serious Home Theater quality subs. And you will not get that quality for your stated budget of 2-300 $. Not new, anyway. Skip that CL svs sub... discontinued 8 - 9 years ago... it's old and 'very' used.
With that budget, for brand new, and your wants, I'd look at the energy S10.3 for sale , um.. today's the last day, at the new egg, for 190 $... it'll get as close as you can hope for the money. click here :
http://www.newegg.com/Product/Product.aspx?Item=N82E16882269026
this little gem won't fill a huge room, nor will it produce 'club' sound levels, but for the price, you can't realistically expect either. It will go deep, and moderately loud, in a small to ... cough, cough... medium room, depending on ... room size, openings to other rooms, preferred listening volumes, and realistic expectations.
OK, for a small room, not cranked too loud, it'll beat anything else out there, for the price, IMO, YMMV . Or up your budget.. or lower your expectations. Not trying to harsh on ya, but truth.
It's the best 'sub' 200 $ sub available today, period.