Best powerleveling duo?

I have most of the impnotes melee weapons from PoS, next thing I want to do is powerlevel all the classes up and I love feeling like a raid boss in the process.

To maximize AA/motes I'll be using two classes I already have at 50 and the 3rd class will be the carry. That being said, what would be the recommend primary and secondary class be? I have war pal and sk unlocked for the primary slot. This will also help narrow down where to use my weekly motes.