with 100k dps you better stay at lower MP.
If you really want to farm MP5+ "fast" you need a big moneypocket and 180k+ dps.
i invested some money in a 200k dps monk (unbuffed, rare weapons, no echo, no skorn, 2,57 aps) and i think i don't get this investments back within 2 or 2 months -.-