The Sanders magtech is $5,000 so outside the scope of this thread - unless they have a less spendy one I'm not aware of. It is also designed to drive wildly varying impedance loads of electrostatic speakers. maggies, while planars, are NOT electrostatics and present a simple 4 ohm load across the freq. range. They certainly can use a lot of oompah but are a lot 'kinder' to amps than electrostatics.
If I decide to replace my somewhat elderly Sunfire with something at the $3k or above range, it might be the new Benchmark...
Thanks everybody for the responses! And have a good new years.