youd be looking at an spl sub from velodyne... the other two on your list im sure are excellent as well. seems like the velodyne will run you a little less for the spl, so perhaps you could get an hgs or dd series if you find the right place to buy. i have been talking about velodyne so much lately they should make me a salesman, so ill not dwell on them here. i will just say that they make excellent subwoofers and whichever you get in your price range from them would be superb.

i think the svs's are overpriced, def tech uses a different approach than most sub manufacturers so i think they would sound the most unique and perhaps a better fit with what you have. however you have one of their subs now, so maybe it is time to change...

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