You haven't mentioned your budget but I have found the Cary Audio SLI 100 to be a fantastic combo with the Magnepans.
Magnepan 3.7i amp pairing
Hi folks,
I’m on the verge of springing for Magnepan 3.7i, despite their drawbacks: power-hungry; hard to place off the wall; size; etc.
I listened to them via Rogue Audio monoblocks, which I can’t afford, but I’m being told that the Rogue Audio DragoN Amp and Rogue RP-5 v.2 pre-amp is a sufficient combination to drive the 3.7s. No doubt my current Rotel 1572 integrated amp is not enough. Will probably add, later, two subwoofers beyond the current JL Audio 110, perhaps RELs.
Thoughts, when time allows?
Many thanks,
paul