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Later lenses and those marked MC are significantly improved over 'silver-nose' versions.
The OM2 metering is supposed to be pretty awesome for long exposure photography.
The f3.5 and f2.8 28mm lenses are both good. The f3.5 is a great snapshot/pancake lens. My f2.8 35mm was a bit rough. I didn't really like it. All the 50s are nice (the 1.8 is tiny and awesome) as is the 55mm macro. The compact 85mm f2 is my latest addition and I'm finding it pretty great to use so far.
The good f2.8 zooms and posh ED lenses are basically impossible to get hold of ... I think because i/ collectors and ii/ digital users want them.
Just won a 50mm F1.4 on eBay, can't wait to try it!