I would check into Audio Concepts "Titan"! Check their Web-site too: www.audioconcepts.com
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Sorry to be contrarian, but I think that the answer to your question is "no sub at all". What you give up in speed and consistency just isn't worth it. My advice would be to spend the same money on electronics that are better controlled at low frequencies--not a perfect solution, since you're playing to the Maggies' weakness, but preferable to a sub.
I agree 100% with Dar. I have owned Maggies and you will spend the rest of your life trying to match a sub with them. The best I have ever heard Maggies sound is in a bi-amped system using tubes to drive the mids and top end and a Crown Macro to drive the bottom end and a Bryston 10B crossover. Crown Macro's can be had for about $1600, the 10B for about $700. Used with high quality interconnects and speaker cable the system can be very special.