I can't speak about the surround speaker options, but I (sometimes) use MMGs with subs in my 2 channel set-up and the combo is very, very good. The trick (especially for music) is optimizing the x-over.
Personally, I'd look for a pre-pro or HTR with an adjustable x-over for flexibility and/or with Digital Room Correction (like Audyssey). These features represent 2 different ways to help insure a seamless cross between the MMGs and Subs when listening to music. Of course, DRC also cleans up response anomalies. I understand that the DRC thing is a philosphical issue for some folks - so YMMV on that one.
If you pass on DRC (or defeat it for music listening), dual subs wouldn't hurt, since careful placement of 2 subs is useful in smoothing bass response for music listening. This will lessen, but not eliminate, the benefits of DRC and allow a more "purist" (i.e. non-eq'd) signal path, if that floats your boat.
One final piece of advice re: amps (or amp section of your HTR)
More power and more current is always a good thing for Maggies.
Good Luck
Marty
Personally, I'd look for a pre-pro or HTR with an adjustable x-over for flexibility and/or with Digital Room Correction (like Audyssey). These features represent 2 different ways to help insure a seamless cross between the MMGs and Subs when listening to music. Of course, DRC also cleans up response anomalies. I understand that the DRC thing is a philosphical issue for some folks - so YMMV on that one.
If you pass on DRC (or defeat it for music listening), dual subs wouldn't hurt, since careful placement of 2 subs is useful in smoothing bass response for music listening. This will lessen, but not eliminate, the benefits of DRC and allow a more "purist" (i.e. non-eq'd) signal path, if that floats your boat.
One final piece of advice re: amps (or amp section of your HTR)
More power and more current is always a good thing for Maggies.
Good Luck
Marty