Subwoofer reccomendations for B&W 805S?

Thanks for the suggestions. Another question I have is right now I'm actually in a 13 x 14 1/2 room. I have them set up on the long wall (6ft away) and sit 6 feet back. When I move to the new 17x15 room I will be setting them up on the short wall (15ft) and will have the speakers about a 1/2 foot more off the wall, and will be sitting about a 1/2 feet more back (setting them up using the cardas method) Am I going to lose much volume going into the new larger room? I like to listen pretty loud at times. (85-90db) I hope my 805s will be good enough for the room. Right now they sound great in the 13 x 14 1/2ft room.

Also I am running them at 200wpc.

Try a rel Strata III. They sometimes can be found used on the gon. Great sub!

Yes, I believe so. I use Spendor SP-1s with my 2 Stadium subs most of the time in a 13'x35' room with a Cardas set up on the short wall. I play them quite loud at times with a 300 wpc amp. I run my main speakers full range, if you use the REL crossover you can gain a little volume increase at the cost of some signal degradation but I don't think you will need it.

I meant I believe they will work well in your new room, I have used my 805s in fairly large rooms and they were fine.