Your Maggies need lots of power, and need it to be stable into low ohm loads, in order to sound they way they should. Stay away from tube amps unless you are willing to go way up on your budget. If you are not too unhappy with your MF integrated, you probably should think about upgrading your source first. You didn't say what your source is, but this is always the first place to go to improve the musicality of a system.
Musical Fidelity A3.2 Integrated vs. others
I'm currently using a Musical Fidelity A3.2Integrated with Magnepan 1.6 QR's..I have no problem with my system but have considered a new integrated amp...Any opinions on the Unison Unico or the Rogue Cronus tubed amps. They're similarly priced and are available with phono....Thanks for any info.