>>2568639FM viewfinder is glorious. Has an LED exposure meter.
Also has a pre-AI flip-tab like the FM2 so you can use pre-AI lenses. Remember to use stop-down metering on pre-AI lenses.
I love my FM and you can get them super cheap its basically a Nikkormat that shoots AI-s natively. Be careful with the motor drive on early variants of the FM it can jam.
John Goodman has a seal kit for it that's pretty nice.