Of the big 3 dead lens mounts, Olympus OM, Minolta MD, and Canon FD, the best one is the one you buy. All of the lenses are mountable on NEX or m4/3 bodies and will yield excellent images. And while Nikon F lenses can mount on Nikon DSLRs you usually have to shoot w/o metering, so the benefit is largely lost.

There is no wrong choice, other than seeking advice forever and never actually shooting one