I know were talking gear, but I would put the voice-over TALENT as 80% of a successful final product. Martin Sheen could probably "sell" the copy through a Shure SM57.
For radio and tv, the VO will be hard limited to within one db of it's life, anyway. (It USED to sound like an expensive mic
)
There are so many different types of VO that one mic is not for every job.
Books on tape? U87 and a real good room.
Hard sell promos? Senn 416
Commercial work? Whatever works for YOUR style. RE20 and KSM27 are good, neutral, modestly priced mics.
Pre-amp? Grace 101. Fast transients and clean.