Greetings from Melbourne, and our next premier is... still counting the votes... it's never ending, well getting back to maggies;
I have used several iterations of maggies starting with the MGIIIa, all the way up to the MG20.1. What I noticed is that depending on the room and your listening tastes (soft to moderate/loud/late night easy listening...) you can custom make the maggies to suit your preferred type of sound. For example, I really enjoyed live fusion type Jazz from Yellow jackets, Spyro Gyra, and Fourplay, hence with the MG3.5 & 3.6 I used big VTL monoblocks. 350w designer reference series, brought the best of the maggie bass with 16 KT90 tubes. They used a superb cj premier 11A with the MG3.5 and enjoyed this combination very much especially during late night listening sessions. Ended up using cj right throughout since cj amps are well capable of superb drive yet smoothness and relaxing sound. Came full circle and ended up with Quad stats with cj amplification, since to me this combination is pure 100% musical relaxation and at soft to moderate levels.
Having said that, it all depends on what type of sound you're after, ss richness, or that warm tube sound which makes the soundstage seem to expand in full 3D. SS such as McIntosh, Bryston, Pass, Magtech, CJ, ARC, Krell, Class'e, Bel Canto, Parasound, Adcom, NAD, Musical Fidelity, Rotel, and the others around that 300w/ch mark & over would be fine with maggies with a tube preamp to give you that warm slight touch and take the ss edge off the graininess. Any tube amp with 100 plus watts will drive the maggies beautifully but like I said, I like to listen to soft to moderate and my room is just average, nothing big. Therefore, I drove my last pair of MG3.6's with the cj premier 11A and cj PFR preamp (at just 70w/ch) the sound was marvelous, way more musical compared to the might VTL's at 350w/ch...
If you can get your hands on a cj ss or tube, try it with maggies and you will be super surprised at the soundstage, musicality and nuances/details of all the ribbons in their full glory. I recently heard a MG3.7i and MG20.7 driven with cj ARTsa and GAT preamp, simply superb! Would have been a good match for any cj tube pre-power amp combination. The MG3.7i is easier to drive compared to the older models, plus the MG20.7 is even easier, it can handle far greater input and requires a very large room to due its magic.
The MG3.7i or 3.6/3.7 (nearly all with similar characteristics) can be tamed with smaller power tube amps, and placed with the tweeters "inwards", the soundstage can be customed to a very detailed intimate soundstage. The moment you place the tweeters to the "outside" the stage expands requiring for a larger room to make the panels disappear.
At the end of the day, YOU have to try different combinations with your maggies, just because we say this brand is better than the other YOUR own ears may not like what we suggest. Therefore, before purchasing, try nearly even kind of combination you can possibly try at home, then also consider the after sales service because there are some real cow boys out there you claim their service is the best, and when you actually have a problem they can't do a dam thing right...
All the best and good luck! Cheers,