Magnepan 1.7 i - Amp suggestions

There is no better amp than the Sanders Magtech for Planar and electrostatic speakers. Got to his website and read some of his white papers. Very informative. Good luck finding a used version. Once people have his equipment, they don't give it up. Ask yourself why.

I use a pair of Odyssey all in monos.  I tried a couple class D amps and the music was just blah.  A couple other AB units I tried went onto protection mode.  The Odysseys have the current needed to get everything out of the Maggie's.  With a Don Sachs tube pre amp, those monos and the 1.7i's; along with streaming through a modified tube DAC using NOS tubes, I'm currently listening to the finest music I've ever had.  And Ive had quite a few systems in my day.
PS....get rid of those steel jumpers and try a pair of inexpensive Anti Cable jumpers.  You'll hear an obvious difference with the change.

Regarding the Van Alstine 400R--tried that with the 1.7's years ago and sent it back.  On paper it looked to be a great match but in listening, I way preferred a Marantz integrated!  Was never able to relax and let the music wash over me in a way the less expensive Marantz did.

For a lower budget, a used Audio Research 150.2 would so quite nicely.   I had one a few years back.

If you ever have some extra funds the Bryston option is terrific as are McIntosh MC501 mono blocks.

In your situation, much is about availability and price, given your location.

Congrats on joining the family of Maggie owners. 

I have had tremendous success with Bryston amps and Maggies.