Still not lusting after any bodies, almost 7 years later.  The F4 I mentioned in my original post developed metering issues in late 2013, so I purged it.  I've stopped buying Nikkormats.  Current FM2n is a camera that was built about a month before my first FM2n that I owned long before I joined here.  So, that issue has been taken care of.  F2A was replaced with an F2AS eventually.  Said F2AS got Soverized last year.  Have a similar condition F to the one I mentioned in my original post, this time with an F-36 drive with cordless pack.  Also have a different, but working F3P.
If I come across a killer deal on a late model regular F4 with P screen and MF-23, and an F5 with MF-28 and L screen, I wouldn't turn them down.  But, I'm not lusting after them.  Nor will it be the end of the world if I never wind up getting those two items.
-J