I dunno, I've still had awful popping problems using a 58, and it's not the world's sweetest sounding mic - I think a good compromise is to set up a good mic (whether it be condenser or dynamic) on a stand in the control room, put in earplugs (you, not the vocalist), and crank the bejeezus out of the monitors so the vocalist can vocalize along with it; a much better vibe IMO than wearing headphones, and as long as you position the back of the mic to the monitors, the sound will get really rejected (and apparently inverting the phase coming out of one speaker helps, cuz there will be a lot of cancellation as both speakers are picked up by one mic)