You will never go wrong with a SM-58 in your kit. Get a Lo-Hi Transformer to go with it. In the years to come, that mic will prove useful over and over for different uses. I prefer the 58 over the 57 for a first mic for several reasons. The ball on the end makes it easier for me to cup well, and it's a pretty decent vocal mic in Lo impedance mode. The 57 is a better mic with wich to amplify an amp cabinet so it's number 2 on my list. Either one will serve you well for decades.