Given needing two characters, it sounds like one of them is the eight set dungeon conquest. I almost always play Necromancer, and it has four fairly easy set dungeons. I think I'll usually do Crusader as well since they're fairly easy.
Hm, I've only ever done the gold streak once, and it's not too bad... but it does require a good set of gear that normally gets trashed. It also requires you to death run through the area opening the doors so they don't slow you down while making the actual run.
Or craft up a bovine bardiche, and cube it to get the "Not A Cow Level". That is so dense with monsters, you just got to the nearest wall, and start going around the outside, and with a fully leveled Boon of the Hoarder you get the gold done in a few minutes.