Subwoofer for music only ?

I'm looking to install a subwoofer in my bedroom system, The room size is 13' x 13'. I'm looking at the SVS 1000 Pro, the REL 1205 or the Golden Ear Forcefield 3. or I can use one of these in my HT set-up and move my SVS 2000 into my 2 channel stereo set up. My bedroom set-up consist of a Micro Mega M-100 with AE-509's, just looking to add a little low-end. Any thoughts on which may be a good match?