I started to say it.
Paladin / Shaman if you want to Tank/Slow/Heal. Hard to do melee dou of semi current content without slowing (although slows are more and more mitigated). I would of said SK+Shaman.. but Meester Groogle (who plays a hell of a lot for someone retired) said Pally+Shaman was better, and he is smarter than me.
Necro / Wizard if you want to kite. A lot summons.. and a lot more you than think doesn't (for example, various Glowing Muramite Rune droppers that Necros can solo). I have personal experience with this dou in Omens/DoN and DoDH content and it's a blast. It does somewhat remove root rotting from my toolbox.. although my Wizard friend used to stun, nuke, fetter.
Both are totally viable to 70.
People dont want to hear that classes other than the ones they have are better, really.