Not a screamer, but have done some "growling" for a song I'm working on. I've been told that the 57's are good for that. I've used both the 57 with good results, but I have a naturally low voice and working with an MXL 990 actually yielded a better sound to my ear than the 57 - probably because it has a larger diaphram to capture that register.
I prefer a large diaphragm condenser (rode NT1 or a c414 ish type thing MXL if I don't have the good stuff handy), into a nice tube mic pre (Drawmer 1960) with compression and a hi-pass. Hi-passed around 100, very fast attack and release on the comp with about a 2:1 ratio for tracking.
As far as mixing goes, there's a lot of limiting, EQ dependent on the mic and mix, very little verb, a doubler when I only have a single track to work with mixed in at about 40%. Occasional delays when the tune calls for it. All effects are on an aux that is post fader.
I do time align a double vocal track to a main vocal track too. It just makes them line up sooooo nice :)