I really like my OM-1. The most "rangefinderish" SLR around (it seems). I've seen comparisons and it's very similar to an M3 in size. It's not very much bigger than an Olympus trip 35! I should use it more often.
I might have to try RF someday, although that my progression might be going to MF rather than using more 35mm.
I've got the "cheapest" OM line lenses and never been unhappy, they fill my needs for sharpness perfectly.