actually any char have his/her own 'kick starter' builds. I.e for barb there are fortress barb, melee snake barb. For zon there are bowzon, jave zon, for sin we have thrower (with creed set trololol).... Best build depend on what style do u want to play, but imo, it's a sin or a zon.
Melee snake barb in theories, can do all ubers, high single ele dmg for heroic bosses, high hp/def + slow to farm. However some1 (like me) just can't do the simple left-click-mobs

Melee sorc is actually pretty boring. She is not a good starter, but maybe, in someway, good, however i don't see any special potential of doing uber in her.