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You want as much magic find as possible. Also remember to gear your follower in full magic find suit. You get 20% of his magic find.

What I would do if I were in your situation is farm act 1 and do pony. I'd also start gathering a strong magic find set that you can farm with.

You're better off farming act 3. Doing pony would be just for fun or to change up scenery. if you have zero Magic Find gear then you're better off farming act 1.