Subwoofer Selection HELP ? ? ?


I am re-building my system for a media room. I have all Magnepan speakers (3.6, and all MMG-W's for center, surrounds), with Bel Canto Ref1000 and Parasound A52 run by a Cary Audio Cinema 11. I really am struggling with what sub to get? I have not yet, but plan to buy a turntable and I have a Denon 5910 (being modded), so I love to listen to 2 channel music, but the room has a new projector and will definitely be used daily for movies/video.

All that said, I want one big sub. I have narrowed my choices to;

Definitive Techology Trinity

JL Audio Fathom 113

Revel b15a

Velodyne DD-18

Suggestions????
macdadtexas
Although it's not infinite, budget was not the big consideration. I had budgeted about $3k for a Sub/Subs, I really want the performance for both music and movies. I will spend more if I need to, but why if I don't? I am looking forward to seeing how the SVS does now. If it's not satifactory for music, I may add a JL Audio Fathom 12 or Velodyne DD-12 and go with 2, which I wanted to avoid, but maybe it's unavoidable.
You won't be disappointed with the PC Ultra.

If your Denon "remembers" bass mgmt settings for different inputs you're all set. Haasle free for movies and music.
Sorry to muddy the waters... but I'd be looking at the REL Stadium or Aerial SW-12.
OK, I got the SVS, this thing is a massive beast. My front Maggies are in beautiful Bear Lake, MN being fixed, so I have not tried to integrate it with them yet. But I did plug it in, and hook it up and play some movies, just to try the LFE effects. Wow, this thing can move some air.

I think I am going to cheat and buy a Velodyne SMS-1 to integrate it. Anyone have any experience with the SMS?