HELP: Subwoofer for music

I would like to get a subwoofer for music purposes. I don't really need earth rumbling low notes(I go to the movies for movies), but it would be nice to hear a low bass tone when one comes along. I bought the plans for the Decware WO32, horn loaded software, but there are so many variables that I am not sure I could build one correctly without building several until I got it right and I don't have the time and money, plus I think I will be hiring a skilled carpenter to build the thing for me(it will still be cheaper than buying it built from Decware). I found another set of subwoofer plans from BESL,, and it looks promising(not as complex to build as the Decware WO32). The thing about the WO32 is that it is hard to find a subwoofer amp plate that will fit in the alloted space of the WO32 without taking it apart and I am no electrician, so who knows what can happen with that. I could just put binding post on the cabinet and use a solid state 100w amp that I am no longer using, but now I need a crossover....and....well....what a mess! The vandersteen(sp) looks like what I would like; 3 x 8in speakers, which would make it fast, but the price is out of this world for me, not to mention that you have to tune it for your system and what if I change my system?

Any suggestion would be great.
I have a similar dilemna, although I'm not a DYI guy. I presently use a single Paradigm Servo-15. It supplements my mains, which are B&W Nautilus 802's, which are pretty fast. The Servo-15 does pretty well, but I like very tight sound and I'm 90% music. I have heard great reviews of the Vandersteen and the RELs. The other unit recommended to me was the NHT Sub Two, with two 10' woofers. It only goes down to 21hz, but is supposedly very fast. I am considering getting 2. I'm not sure if I would supplement or crossover the Nautilus 802s. Any thoughts on this?
My FINAL VOTE: Peerless XLS 12..refer to linkwitz's web page. The real McCoy. Anybody could build that cabinet, the XLS sells for like 150, Hypex subamp 299,..Top Dog!
ACI Titan or pair of Force. I've played w/ many subs. These are the real deal for music.
REL, REL, REL!!! Get one intended for music, at least the Strata. It's the easiest sub to set up and ends up simply sounding like an extension of your speakers. Much easier to set up than the Vandersteen which attempts to do the same thing but, since it was the first to try, is far too comlicated and fussy. RELs just set up and then you forget about it. O.K., maybe a little tweaking as time goes on.

By the way, I had a Janis sub/amp/x-over and the bass notes were just fine. Problem is, it crosses over at 100hz, way too high! I have my REL set at 28hz and the music is seamless.