OM10 is a nice little fun camera to use but a bit fragile. OM30 is interesting as it was AF capable with the right kenses, plus it gives you AF confirm with manual lenses. Battery hungry though and the on off switch couldn't be in a worse place.
OM2n is the standard OM people seem to head for, I prefer the Spot Program myself. I enjoy using it more than any of my other film SLRs, but you have to stick with Zuiko primes for maximum user friendliness due to the way the shutter speed dial works.