Hmm. Since you already have an OM-10, why abandon the Olympus OM system? I'm invested in Nikon, but the Nikon and OM systems are pretty well functionally equivalent; I doubt you'll gain anything significant by switching, and if you end up with two you'll lose.
Originally Posted by bwlina
You'd be as well off buying a 50 mm Oly lens and maybe a 200 as well -- those two plus a 24 and a 105 are most of my 35 mm kit -- and another OM body for a different emulsion. I don't know why, but many posters here and elsewhere mix 35 mm SLR systems; I just can't see it.
Good luck, have fun,