All really depends on how you want to work with the mic. The SM58 is a close-vocal mic, with a 'midrange peak' to suit most vocalists whilst reducing feedback. However, it only works properly if you work VERY close, i.e. two inches (50mm!) or nearer.

A good all rounder is the Beyer M201, which is equally at home miking up a kick drum or a piano. It is particularly good as a 'ladies' mic'.

The wisest way to choose your mic is to contact a sound hire company, and try a few of theirs (I work for one - bet you didn't guess!!?). You will also get real advice from the people who work with them for a living!