Please help educate me. So, for me an OM1 is good but not yet a good fit, but I have a nice ME Super which is. Iif I go search I may find that the eye point for each is different. What other things should I look for?
The three things that matter are eyepoint, magnification and coverage. It's explained by Mike Johnston
here. Focus snap is relative, and depends on the coarseness of the focus screen, combined with the brightness. I measured absolute brightness (as % transmission of the incident light to the eyepiece) in a few cameras, but found that perceived and actual brightness don't always correlate - which is probably why you can get data (a number) that describes eyepoint, magnification and coverage, but not brightness, and why people's opinions on these differ. I, for instance, like the Nikon FA/E/G/M viewfinders, but they are miles away from me considering them the "brightest". The Leicaflex SL, Contax Aria and Olympus OMs with the 2 series screens are among the brightest to me.
Another factor to consider is the telecentricity of the light coming from the focus screen: the coarser the screen, the better the focus snap, but the lower the brightness. The focus screens in autofocus SLRs work like a section through a bundle of fibre optic cables, each with a "lens" moulded onto the front and rear surfaces. They are very bright because all the transmitted light is directed towards your eye, but they are not good for manual focusing because the texture of the screen isn't coarse enough.
The only way to find what you like is to look through as many cameras as you can, then find out what that viewfinder's characteristics are, and if you want to find another camera with a viewfinder that you like, try to find one with specs that are close to the one you liked previously.
Marty