I am looking to get a new sub that is smaller than my Definitive Technology PF1500 15" 17'' X 20" X 18'' 500watts 14Hz-150Hz sub. Its just too big and does not fit in my home as I get older. I am looking for something small that puts out close to the same performance. Which is the better sub:

Velodyne MiniVee $800 10"X10"X13" 1000watts 28Hz-120Hz
Def. Tech. SuperCube III $700 10"X10"X10" 650watts 16Hz-200Hz

$600-$800 is the most I want to spend. Any other sub ideas, SVS subs. Thanks.