Trapper + Summoner -- incredibly easy
Javazon + Hammerdin -- incredibly fast killers with no gear, but comparably fragile
Orb Sork -- rather fragile, somewhat gear dependant, but can run meph if you can get it that far
As much as i enjoy playing summoner necros, I seem to have more survivability with a trapper. I always end up loosing my necros when they get amped and I don't realize theres a monster standing next to me.
I'd go with either a javazon or a trapper, mainly because you easily can nm cow with them without killing the king. Cow until you've got a few skillers, then trade them off for all the gear you'll need for your "real" MFer. That's what I'd do if I had an internet connection. Either that or destroy my CDs. One of the two.