My opinion, especially with your description of desired sound for your voice; SM57.

58's are nice, but for some reason I don't like the bottom end of a 58 on my voice .. the 57 seems to fit me better (others I record with feel the opposite; they like the 58 for their vocals). It's a personal thing.
Spec wise they should be very close, but to me they are not.

Plus you can use the 57 on guitar, snare, etc., very serviceable mic.
I think it's a great first mic for anybody starting out and if you don't have one, you should!


Make your sound your own!
.. I do not work here, but the benefits are still awesome