If everyone gets a SM58 is a VIABLE option then I would go with that. Each mic can then be balanced for individuals volume and tone.
Watch out for feedback as several mics placed close to each other is notorious for bouncing off each other and causing such problems. I also thought that originally you were referring to a condenser large diaphragm mic as I am not too "shure" pardon the pun about shure mics and their model numbers. I prefer other makes.