Thanks for the input everyone! In the end I grabbed a Nikon F. It’s a touch smaller and quieter than the F2, and most importantly about half the price. I'll have to come around to the hard-edge aesthetics
and I've already found a Nikon F4 screen I can transplant when I CLA it so it's nice and bright.
From what everyone has said the FM/FE's don't sound that different to the OM2 I already have access to, and if I want something really compact I can grab my beloved Leica iif. Also, after looking into lenses, having something designed for pre-ai glass will be a blessing on my budget. The Nikkor-HC 50/2 sounds equal or better to the summaron I just spent a small fortune on, and can be had for peanuts.