If you have an Eminent Technology dealer near you, consider giving their LFT-8b a listen. It has a pair of magnetic-planar midrange drivers (similar to those in Maggies, but with magnets on both sides of the Mylar, for push-pull operation, hence lower distortion) for frequencies 180Hz to 10kHz (with no x/o in it's range!), a ribbon tweeter for 10K up, and a sealed-box dynamic woofer for 180Hz down. An 8 ohm load to the MG1.7's 4 ohms, so a better match for a tube amp. The LFT-8b is also more punchy, dynamic, and full-bodied (less "wispy"). You can read a very comprehensive review of the speaker by Robert Green in TAS on the ET website.
Another way to go is to get a pair of the new LRS (only $650 plus shipping) and some subs. That combination may provide you with what you find lacking in the 1.7.