Budget AV Receiver with Magnepan

I highly recommend against driving any 81 to 83 db, difficult 4 ohm speaker load on ANY receiver ever built, personally! Not only will the sound be rather flat in spots, but you'll likely be cooking eggs on top of the receive unit.
I say, no go...
Here's one: Go on line and find a bunch of Maggie retail dealers, and give em a call! Say you are considering buying some Maggies, and want to know what you should drive them with. Any sane dealer should tell you pretty much the same

"...I *am* unfortunately severely budget limited, $500 or maaybe stretch to $800. So I'll always be compromised in some way" (BFrank1972)

Yep, I recommend this route EVERY TIME, BTW, over an all-in-one receiver route for your maggies: Some $400-$600 range newer Denon, Yamaha, Harmon Kardon receiver on the net at slashed rates in the $400 price range - THEN ADD A 5 CHANNEL USED HIGH CURRENT OUTBOARD AMP!!
Several amps come to mind on the used market. However, you can probably find a great deal on some a Beefy Parasound HCA-1205/1206 for $500 range. Cheeper option would be Some Adcom or Rotel piece for $400-$500.
Either way, this option would be a much better combo approach than simply the receiver, IMO.
Old school tech, used would be to at least recommend an older Acurus Act 3 at $300, and adding an amp to that.
I like either of these older and newer tech routes over what you are attempting. (I speak from 20 years of pro and hobby experience in this)
Of all the receivers you mentioned, I like the B&K option the best with your maggies (but it has no newere codecs, Room DSP, EQ, limited bass mgmnt, likely, etc). Still, I could NEVER get my self to drive any Maggie (I've sold em in two high end stores, thus far) with a reciver - NO!