Appropriate Power for 1.7i's


I am sure this is the type of question that gets asked a lot, so I beg your indulgence for one more:

I have recently upgraded my speakers to a pair of Magnepan 1.7i's.  I am enjoying these speakers even though I know they are not receiving an optimal signal.  My goal is to provide a better signal.
 
My primary source is TIDAL HiFi, and here is my current setup

Power:  Yamaha HTR-5450 (only front channels used).  Ostensibly 85 w/channel --- I am aware that the specs for home theater receivers tend to be -ah optimistic.

DAC:  ifi nano iDSD (burr-brown)

Digital signal provided by PC

My budget for upgrading the Yamaha is modest:  $700-$900

Here is my want list:

100+ w/channel Stereo into 4 ohms.  ( I have no need for more channels):  Preferably Class A/B  (as opposed to D)

I am not opposed to purchasing used, in spite of the additional effort involved.

I am considering the Denon Heos and  Sonos Connect as a preamp.  I am not opposed to an integrated amp, but I like the fact that these units allow me to control my selection via a phone app (my phone is an LGv20 w/ Android 7).  Since I tend to listen to albums rather than individual songs or even playlists, the lack of this convenience is not a deal killer for me.


128x128markainsworth
@OP
A used DNA-1 (unmodded), should be around $800-900. They come up frequently. If I were you, I'd wait. Also, contact SMc Audio in CA. Steve McC is upgrading all his old equipment. I'm having my DNA-1's converted to monoblocks as we speak/write. He might have a DNA to sell, too. 
I'll PM you with some other info.
Bob
The suggestion to get the Bryston 4B St is a very good choice. Those amps are powerful and sweet. One of the best bargains in hi-fi. 
The last I heard Steve McCormack is out of the production and repair fields.  Repairs are being handled by Conrad - Johnson and there is no further production of McCormack products.  Its a shame because Steve was one of the good guys in the industry.  Not sure what happened.  
I had the 1.6 and now MMG pending an upgrade to 1.7. After much research I called Klaus at Odyssey and told him of my system and the planned upgrade of the speakers. He custom designed what is essentially a Stratos in a Khartago case with several upgrades added. I have no regrets at all. It mates perfectly with the MMG and when the time comes (pending a larger dedicated listening room) I'll get the 1.7s and have him convert my unit to mono and build an identical one for the other channel. 
I agree with all the high current delivery into a 4 ohm resistive load comments above (and so does Maggie - it's on their web site)

There are lots of amps that can do that and will sound really nice - most are SS; you can use a tube pre-amp for your euphonic hit

Don't let your voltage rails sag