xping is the best here
1-3 blood moor to cold plains
4-6 stony field to black marsh
7-10 Tamoe highland to outer cloister
11-14 barracks to catacombs
15-18 sewers to tempel of vipers
19-20 arcaines to tal rasha tomb
21-24 spider forrest to Travincal
normal - act 4 25-30
normal - act 5 31-40
nighmare - act 1 33-43
nighmare - act 2 44-52
nighmare - act 3 53-57
nighmare - act 4 58-63
nighmare - act 5 64-73
hell - act 1 66-76
hell - act 2 77-85
hell - act 3 85-90
hell - act 4 90
hell - act 5 90
from lvl 25 u gain no loss of xp when u fight against monster with much higher lvl then u.
hope it helps.
if not -> call my name ând i´ll be there <img src="/ubbthreads/images/graemlins/cool.gif" alt="" />