B&W Nautilus Subwoofer to match N804s


I am slowly but surely building my complete Nautilus home theater system. Yes, I haven't eaten anything for a while, but it is worth it. I have purchased the N804s for left/right and the HTM-1 for center. Eventually I will buy two more N804s for the rear (or possibly upgrade to the N803 for the front). Anyway, other B&W owners, what sub do you have with your system? Does B&W make a worthy sub, or should I look to something else? My room is about 17x15, and the sub will be along the side wall, not in the corner. Thanks.
argent
I have a REL Storm III with a pair of B&W Sig 30s... I was originally going to use it only for Home Theater because subs usually don't work well for music but I am a believer... it was simple to place and integrate (something tough to do with subs) and couldn't be happier with it other than wanting to get a 2nd one.
I am using the Vandersteen sub with my N804's in my 2 channel music system and have been very happy with the results. Really blends in nicely and fills out the rather lean and weak low end of the 804's. I use a HSU sub in my HT setup. I don't think that it is as good as the Vandy but you really can't beat it for the price.
I have the Nautilus 802's and htm1 and N805 for my rears. I use a asw 2500 but I would go with a REL.
You may not need a sub of much size if you use 803s instead of the uptilted 804s. But my take is from a 2 ch music perspective, not HT. Have fun.