ebterp.
When I was sub shopping, I loved the specs of the 250P however when I was auditioning them, I found it lacked the punch and dynamics of what I was looking for.
I ended up getting a Velodyne DLS 3750R (CHT-10R here in Australia) over the 250P.
Not sure of your budget though if you read the gazillion posts on here, HSU, SVS, and some of the Velodyne all get good raps..
If I had my time again, and could have streached my budget a little I would have got the HSU.
This is an area where you really need to get your ears to make the decisions. Grab some material and head to your retailers and do some listening.
Good Luck!
A