but one thing is bugging me.

Dave Grohl is singing into a Shure SM57, a Shure SM58 (I think) would be much better. The main differnce is the SM57 is Low Impedance, & has no pop filter. Where the SM58 & does. I’ve only ever used SM57's on mic’ing up instruments, never for vocals. It’s do able, but I don’t like it.