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

Although the sound is most certainly inferior to my best FM tuners, I still love the jazz station on my Polk Sirius/XM satellite  tuner (or my pal's Marantz). Quality programming can supercede a loss in accuracy, and this station does just that, to the point it does not matter.  The music is too good to pass up, and begins to sound really good, as your ears adapt to the supposed burn in that audiophiles think exists.. Selection is much better than the algorithms used for streaming mass appeal top forty of each channel genre, not to mention continually going back to songs already played.  The knowledge of a long time fan/DJ works much better than having a computer tell you what to hear.

So you want to go analog FM.
first consideration , actually shared by 2 main issues. You are going to be dependent obviously on what stations you have available within 100 mi radius (best case scenario with rooftop antenna) and of course your taste in music and if there are even stations that provide an eclectic choice of music (if thats what you want) or how bad you want to listen to truly non commercial independent stations such as college stations/community stations or other semi non commercial stations such as NPR type. Well, NPR are generally always available although depending on their music formats can well be someones cup of tea.

The other important factor and focusing strictly on analog FM this can not be stressed enough ---Its not how good the tuner is (although of course one wants a decent performing tuner) Its how good your antenna is. . and by good is meant that the only ,, the ONLY type of antenna that is going to enable the best possible sound from ANY given tuner is a rooftop rotatable yagi style FM only antenna. Which have pretty much been discontinued by major brands like Winegard. There are substitutes available that combine uhf ,,etc. (not going into that for purposes of this post) Possibly still available from an obscure vendor or 2 online last I heard.

Antennas for tuners were never stressed back in the heyday for purposes of selling the highest priced tuners. Why would a salesperson sell you a 120 dollar entry level Sansui or Onkyo or Pioneer if they can instead sell you a 600 dollar Mac back in the day telling you that it is built in the best possible way with the best parts.. yada yada.. (Ive had 3 Mac tuners and they are good and they perform most noticeably best using a rooftop antenna as ALL the  tuners I have had do. 

The point is this. a $150 tuner is going to sound better than a $800 tuner when the lower priced 3 or 4 gang tuner is using a rooftop antenna compared to the 5 or even 7 gang tuner that is just using a dipole or Any other indoor antenna set up.. Its just the way it is. The tuner has to get the best possible signal to be able to perform its best. An obviously being up there on the roof pointed in the direction of the tower is going to get it on. To be clear,, I’m talking about using indoor antenna vs using rooftop antenna . So of course the $800 tuner is most always going to sound better using a rooftop than the $150 using the same rooftop set up.

I had used a simple dipole antenna since the 60’s listening to local FM . It was not until the early 2000’s that I installed my first yagi style fm only antenna --a Winegard. The difference in sound quality (not to mention reception ability) was literally mind boggling and mind blowing and became a source for major music listening for me. But of course, I had lived in an area of the country that has long been just blessed with many good FM stations including multiple independent college stations which are often low power but living within 30 miles and using rooftop antenna would provide very good analog sound. rivaling at times vinyl sound or whatever you want to call good analog sound.

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.