Monk: MP 2-4 Depending on how much of a challenge I want.
DH: MP2 Will bump this up when I get more dps.
WD and Barb: MP1 just because I don't have alot of practice on both classes.
Group play I'm comfortable with my monk up to MP8. Playing on MP8 brings back those old school days where you have to be on with your timing of skills/positioning or your character will take a face plant right into a elites wang.
Minus the health part.