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
The only cameras that shoot without metering are the low end new ones. Anything D90 or above will meter, and those are the cameras actually worth their salt anyway.
In other worlds he has
darker days, blacker swells.
Strokes that mix noir revenge
on waves of grey.