Top vintage receivers vs. modern high-end equipment

Add me to the list questioning your decision to purchase a receiver.  Many stations stream their broadcasts and IMO a decent streamer from Bluesound or  used Auralic Aries (I own an Aries mini) will provide better than or equal to SQ of a tuner. Grace digital also has a selection of what I consider entry level tuners but still mostly equal in SQ to a receiver. 
As for age, I have an LFD Mk3 which has to be 20 years old and I am extremely happy with the sound. I am sure there are newer integrateds that sound marginally better, but I cant justify the price. 

Look into Nakamichi. I have a Receiver 2 which is amazing. The Receiver 1 at 80 watts would be even better. Both have great MM phono stages; but they are early '90s, not '80s.

The TA series from the 1980s designed by Nelson Pass was legendary
http://www.audioreview.com/product/amplification/receivers/nakamichi/ta-4a.html

The TA4A even has a MC input!

Look at Ear 509 monoblocks from the ‘90s: i never heared a better poweramp like that!!!

Your answer really depends on what you want to accomplish.  First- AVOID a vintage receiver !   Even a fully restored Fisher 500c or Mac 1500 will not be good enough for your speakers !

Do you want vintage tube ?   Heath W5m, Eico HF 50 or HF 60 monoblocks.   Fisher 50a or 90 monoblocks.  Of course anything from a Mac MC30 to MC75, and MC240, MC275 would work.  Harman Kardon Citation II  aka "The Duece" would be ideal !  

For a preamp- some swear by Marantz 7c, or Mac C20/22.  Some love the Citation I, or Fisher 400cx.

Do you want vintage SS ?   Mac SS equipment is well regarded, dead solid reliable and tends to sound good- after a careful restoration.  A sleeper is the Mac MC250 / their first SS amp and it sounds like a mix between a tube amp and solid state.  A Marantz Model 15 is another under rated amp- it is actually a pr of mono blocks on a common chassis- ONLY parts shared are the faceplate and power cord.  

For a preamp you have a lot of choices.  If Mac I would not consider a C24 or C26; it is only with the c28 that Mac produced a good smooth and excellent sounding preamp.  Again, caveats of restoration apply.  Some say a fully restored Marantz 7T also can sound very good.

Newer equipment can sound good with your speakers.  Most Audio Research tube amps and their classic tube preamps would be ideal matches.  Vintage Luxman.  Vintage Accuphase.    Both good choices.

If it were me- I would go all tube !

Lot of choices- but stay away from receivers !

I have a JBL Metregon, your Paragon's little brother.  We are both very lucky people!Both the Metregon and Paragon are pretty efficient and I have run mine with both tubes and ss.  With the Prima Luna Prologue 6 monos (with either Psvanes KT 88 Mk II IIseries or  JJ E34L Blues the sound is as you would expect very tube like.  Warm and rich with the E34Ls I think surpassing the KT88s in a very sweet and detailed midrange. The power difference isn't that great between the 2 sets and the Paragon doesn't need it anyways.  The KT88s have a slightly deeper defined bottom end. I ran a friends' 12 w tube amp to demonstrate it for him and the Metregon could still blow out the room.
I have many hours running the Metregon with a Pioneer SX1050 (fully refurbished) and because the 1050 was designed to be tube like there is very little difference except because of the 1050s power the bass is stronger and I think more detailed.  The mids and highs are very nice and certainly very acceptable but not in the cat of either tube set. I think the horns like the tubes better.So take this for what it is worth, I really don't think you can wrong either way
Best 
Mark