Subwoofers

Gee, an $8K  sub for a $1K speaker.
I think the OP might want something a little less expensive, even if they are worth every bit of it.

I believe Vandersteen 2w and 2wq's are often paired with Maggies to great results.
But, I am prejudiced, cause I own them.
I have also heard good things about Hsu subs in terms of sound, but not regarding pairing with Maggies.
Have you checked the Agon post archives?

Wow, akg, that was a very thourough post. I hope the OP will take your advice, everything you said is true.
Zardozmike, as I said, I have the 2w subs. Using the M5-HP crossover, will seamlessly combine the subs with your speakers. After having been away from the hifi world for 30 years, it was truly revealing how a good sub can influence the sound of a pair of speaker. (As in, they weren't around, then).

Thanks, gillatgh.
Hey, OP, have you come to any conclusions?

Zardozmike, if you want 'seamless', then I urge you to try/audition the Vandersteen subs. They are without a doubt, as seemless as you can get. I don't know where you are located, but look up Johnny R on Agon, he is a dealer who can guide you. And, no, I have never bought anything from him, but he offers his insight and experience for free.

Nice post, Montaldo. I agree with your perceptions.
Vandersteen subs, coupled with the m5-hp crossovers, make for a seamless integration.