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Just a couple of thoughts Jack;
The OM 1/2/3/4 are much better. Sadly they will cost more and do have a couple of issues relating to battery life/type and prism foam.
If you're on a tight budget but still want a great camera I'd have a read, and look for Konica, Minolta, Yashica bodies. You can still these on the ffordes or LCE websites sometimes.
Some of the motor driven, plastic Nikons like the N90(?) are cheap and supposed to be ok but I've not used them. The Nikon EM is another one to look for and a really nice camera.
You'll find myriads of cameras like that, in that price range, from all the manufacturers.
They all "do the job" basically; image quality has more to do with the lens(es) you attach to the bodies.
If you have good lenses already you might just go buy a body you can use them with.
Like with the compact cameras it pretty much boils down to personal preference in the end.