I find MP8 to be my sweet spot for paragon levelling at the moment. I play a 380k dps (buffed) Archon Wiz.
Am keen to add some people in my friends list who play the same level or if you play MP10 and don't mind carrying me a bit then let me know too..
My Run is normally:
Festering Woods -> Leorics -> Fields -> Decaying Crypt (if spawned) -> Weeping Hollow
Give me a message here or in game if you are keen.
My BNet tag is in my sig, and although next week (wednesday) I'm going on a 3-week trip, as soon as I'm back, I should resume my paragon farming