high end subwoofer...which one tho?

You might want to take a look at this review:

http://www.soundstage.com/equipment/paradigm_sub2.htm

I run two JL Audio F113's ...... STELLAR RESULTS !!!

There's lots of good subs out there for sure.
I have been quite curious about the Paradigm sub25.
if you like reviews, a few have put it above the JL Audios.
I haven't heard it,but she's suppose to be the one to beat,
except perhaps the sub2.
Of course that could be debatable.I have a 11X15(with Gik traps)and use 2XDD-15s(for music)I like two better than one as
you can sit anywhere and it's a nice layer for the higher
instruments to dance on,nice and solid.
I do want another just for movies as it saves me reconnecting and adjusting the EQ ect.
even in a small room two is better than one as I and many others have discovered.

I own two F-15 subwoofers from Rythmik Audio with clear, articulate, fast and not flabby results. They're audiophile subwoofers that do extremely well in both two-channel audio listening and home theatre applications. I spent several months researching subwoofers over the Spring and Summer, so I know what you're going through. The questions seem endless...

1. Driver size?
2. Room volume?
3. Ported vs. non-ported vs. TL
4. Amp power... what is too much or too little?
5. Cost considerations... best bang for buck.
6. Build quality and reputation?
7. Audiophile or Godzilla foundation smashers?

I chose Rythmik Audio after talked to representatives from all the usual suspects. I'm very pleased with the F-15's.