I will try to figure out my build in sigma - 'till now had no opportunity to play, so I'm full of hopes. It's pre-sigma universal build, and I will try my ATMG assassin this season.
I've found the Necro Malice build to be an easy self-find build to level up quickly and farm Teganze, etc. for the sets/uniques that other builds need. Totemancer, too - but I don't know how that build has fared in 1.3/1.4 or will do in 1.5.