( FM2n is the backup, at least in a way: I keep it loaded with 400 for a "grab and go" camera for when it's too late for 100 handheld in with my F3 )
I like the F3's viewfinder better too. I've only had my FM2n for a short while, but it feels wonderful and natural in my hands, so I definitely love them both. I too love my 24mm AIS, it's my favorite lens. I hope whoever buys your remaining cameras has as much fun with them as I am.