having the necro curse tree would be epic for every class, ( except shapeshift as they wont be able to cast curses in that form)
but you need to consider that vs paladin offensive aura
after that any aoe elemental build would be crazy
like imagine ele druid with the ability to cast amp and lower resist instead of having shapeshift tree
probaly light sorc tree as that comes with tele
overall i would say:
your fav damage tree
curses or offensive aura
something else, to support w/e damage tree you choose
maybe passive from zon or barb or shadow discipline from sin