Like many posters, I too will go with the Fuji GA645, but with one 'disclaimer' - this camera is now old and fully electronic, and as I have found to my dismay with two of them in the past year, prone to failure.
After having had two - a GA645i with the otherwise wonderful 60mm lens and then a GA645wi with the equally great 45mm lens, fail on me in the field during shooting trips, I reluctantly decided to give up the GAs and go with the much simpler, albeit not "technically" a rangefinder, GS645w, but again noting that the GS, while fully mechanical, is somewhat flimsy in build and in fact is older than the GAs I owned.
I tried, but I just could not warm to the GS way of shooting, and while my results were ALMOST as good as those I had with the GAs (which as one poster has already noted, may be due more to the photographer than the tools), in the end I sold it. So i am now entirely out of Fuji GAs and GSs.
Many other cameras are MF and compact if these are your only qualifications. I own a Zeiss Nettar 6x9 with a superb 105mm f/4.5 Novar which produces excellent images, but again I'm not entirely comfortable with an eight shot to the roll system and much prefer the convenience of 12 6x6 cm negatives to the one roll. For now my Rolleiflexes are doing the job and when I want to go super light, I put my Voigtlander Perkeo I, a UV filter, a lens hood, an old Weston Master V and of course some film into my backpack and off I go, either into the hills of northern Tasmania or more exotic locales of Southeast Asia. for me, simpler is better. BTW the Voigtlander 80mm f/3.5 Color Skopar produces the sharpest black-and-white negatives I have seen in any other camera but the Rollei - more like engravings.
In all you have plenty of choices and you can look forward to the fun of looking, handling and eventually choosing the MF compact camera that best suits you and your needs.