@meiatflask, if you choose to go with a planar, take a look at the Eminent Technology LFT-8b, another magnetic-planar loudspeaker. A pair retails for $2499, and home auditions are available. Read the review by Robert Greene in The Absolute Sound to get an idea of if they might meet your needs and expectations. The speaker is 13" wide and 60" tall, the m-p panel itself only 1" thick but mounted atop an enclosure containing an 8" dynamic woofer for 180Hz down.
The LFT-8b will play louder than an MG.7 and 1.7, and extends lower in frequency. The ET LFT drivers are a push-pull design, superior (more linear, lower in distortion) to the single ended of the Maggies, and much better constructed---in a metal frame, unlike the glued-onto-MDF Maggie m-p driver. Also lower in moving mass; the Maggies have wires glued onto the Mylar as signal conductors, the ET’s have etched foil conductor traces (like those on a circuit board). Really no comparison.