Concerning the RE-20, did you see the thread titled: EV RE20- wicked bump at 300-400 HZ ? ? A good amount of advice is in that thread.
Jim Williams mentioned that he really likes the RE-20 with transformerless low noise preamps like your Grace. My RE-20 gets regularly used with PM1000 and Hamptone JFET pres. I'd be intrigued to use it like Jim suggests, but have not yet had an opportunity. Mine are mostly used on Kick, Bass amps, Trombone, etc.
Sometimes it (RE-20) really works well on vocals where you want a bit less detail than a condenser gives, like with an older vocalist. I think you will also enjoy the RE-15. The older dynamics made by AKG, Beyer (M-69, M-88), EV (RE and PL models) and Shure (why the SM57/58 became standard instead of the SM-53/54 must have been a price issue IMHO)before the explosion of cheap condensers include a wide variety of colors which are now routinely overlooked.
Galil