Dual or 3 boxing, maximizing gold?

[3box]

I have 5 accounts, one with a 70 paladin(I stopped playing 2 yrs ago). Sometimes my wife plays too to help out. I really prefer to play 1-3 accounts only these days.

I used to run Stratholme with my pally to power level the other accounts, that wasn't bad back then. I've seen the Hobbs videos of his 80 doing Karazhan trash for gold, looks interesting. I'll look into the dailies when I hit 80.

With 3 toons @ 80, what do you recommend I do to make gold?

Thanks in advance.