I can't imagine not having either a SM7b (personal preference) or a RE-20 for vocals... Far and away the most used vox mics I have.
Yes, far more than the U87, which really isn't all that great of a vocal mic by comparison IMO... But for strings or wind instruments? Sure.
7b, RE20,
PR40, MD421 -- All basically tailored for the human voice (although they're certainly capable of more). You're doing yourself a disservice not having a couple to choose from... Pick any 3 for around $1k (or just grab a 7b and a P-Solo and there's your vocal chain for just about anything).