I have an FS. Amazingly KEH had it for fairly cheap and I got lucky. I also have a Pentax SL, which is a meterless Spotmatic. While I have a lot of meterless medium format cameras, I love these because guessing exposure on an entire roll of bulk rolled 35mm is a lot less expensive than 120 or sheet film. So I use them to train my eye for exposure.
If there is any I'm missing, it probably a Philips 8x10. There are a lot of limitations dealing with 8x10, and I've settled on a very capable but fairly heavy Toyo 810mii. Everyone claims that the Philips combines light weight, capability, and enough rgidity. But I almost never see them for sale, and when I do I can't afford it.