Can anyone recommend an FM Receiver that would play into a relatively high end system?

Can’t go wrong with a Magnum Dynalab tuner.

A great value is indeed some of the better Sansui FM tuners.  If you are on a budget I agree to seek out one of those.  Note: I sold many of them in my early retail days.  Really nice sounding, never a problem, should be a solid vintage tuner for todays purchase.  Someone above recommended an Accuphase T-101.  I wholeheartedly agree with that.  Years ago I had an entire stack of Accuphase which included the T-101 tuner.  It was stellar!  I am still kicking myself for selling that stack to my nephew.  If you can find one grab it.  Built like a million bucks, beautiful looking, sonically satisfying (given a good antenna connection, of course).  It has that quality sound of analogue, almost like that of vinyl.  Good luck in your quest for a quality FM tuner.

Millercarbon's ridiculous assertion regarding receiver quality aside, if you are looking just for FM there's no reason to pick a receiver over a tuner, even though TOTL receivers often have excellent tuner sections.  Tuners are designed to do one thing so why not put all your $ into the function that you care about?

The type of tuner to look for depends in part on your physical environment.  In a dense urban setting with lots of buildings and stations, you'll be better off with a tuner that has good selectivity (the ability to parse signals that are right next to either other) as well as multipath ability - handling multiple reflections of the same signal (from buildings, etc.).  If you're in the boondocks, then sensitivity (the ability to capture weaker signals) is more important.

Then there is sound quality.  For example, the aforementioned Sony XDR-f1HD has amazing sensitivity.  I had one that was modded by XDR guy - I recommend the mods - but I sold it because the sound quality was just not there.  But there are many, many others tuners with great sound quality.  If you get something vintage consider that you may have to sink in money to get it recapped and aligned.  I have found that to be a good investment.  

As someone else mentioned, a good antenna is a key component of the FM stream.  It makes no sense to spend a bundle on a great tuner and then attach it to a crappy antenna.  A great antenna and decent tuner will often give better results.  

I have never seen a tuner with XLR but that's not to say they don't exist.  Most use RCA.

Here's a list of tuners I own or have owned and found to have great sound quality:
Tube:
Scott 350B
Scott 310E
Fisher KM-60
Fisher FM-1000

Analog:
Sansui TU-9900
Mcintosh MR74
Sansui TU-717
Sony ST-5000FW
Tandberg 3001A

Digital:
Denon TU-800
Sony ST-J75

Tuners that were ok:  Marantz 2130 (but amazing eye candy!!), Sony ST-555ES, Sony TA-A6B.

Tuners I did not like, even though they are highly rated:  Kenwood KT-8300 and 600T.

You can find any Mac tuner at Audio classics. The mr78 is legendary. The downer is fm signals are not from analog sources any more. And converting to digital?..ugh. If you want digital, a magnum dynalab Sirius XM is a very good choice. There is a plan to purchase both a terrestrial feed and a car feed in one plan. I always enjoyed listening to cousin Bruce Morrow and the 60s music. I’ve owned a tandberg 3011, and that was very enjoyable too.
good luck. 

Hello cdc77. Not all receivers are "crap." They sell pretty well. Any upper end Integra (Onkyo's premium brand) receiver will do well and have that "hi-def" or whatever FM capability. We have one station in the LA area that has remarkable - CD quality - sound. It is really astonishing. You may be able to find a used Carver tuner (too old for the fancy FM feature, but good) or the cute little Sony tuner (now discontinued, selling used for more than new, quite good). But the convenience and flexibility of the receivers are hard to beat and available at very low cost as new models are constantly replacing "last year's" versions. Be sure to get the remotes, DSP microphones, and AM antennas with the used units. Used Integra receivers sell here for a few hundred dollars and are great values. I have seven, nine, and eleven channeI versions in various systems and but them, when available, to give to "newbies" to get them started in the hobby. I use some as receivers and some as "front ends" for good power amps and electronic crossovers. They have many surround sound options for 5.1 and up systems. Stereo sources can be synthesized into multi channel sound (the one I use the most gives me 16(!) options for multi channel sound from stereo sources plus mono, all channel mono, and direct - no processing at all). Many of are extremely pleasant. Also great for immersive sound on sporting events. An eleven channel unit offering 100ish watts per channel is not going to be stressed running a 5.1 or 7.1 system. The extra channels can be used for running other program sources in to the bedroom, garage, or patio speakers. Bach and Brubeck in the main room, ball games in the garage, Sesame Street music for the kiddies outdoors or in the playroom or basement? Radio news for the seniors in the granny flat? Enhanced lifestyles available cheap on the used gear market! Think about it! Happy listening.