I dinged 60 in the middle of Act IV in Hell difficulty. I didn't spend a whole lot of time farming anything as I leveled, I just concentrated on burning through the content. Now that I'm level 60, I plan on jumping into Inferno and trying my hand on Act I. I invested about 4 million gold in gear to hopefully get my resist all up a bit and also tacked on some additional gold find. Looking at the screenshot above, I feel like I need to invest a few more thousand into dyes to make my Barb look less like a clown and more like a money making cash cow.
I'm still spending the first 20 minutes to half an hour of my in game time combing the AH for deals and bidding on a bunch of items. I've really learned a few markets and have been trying to expand my horizons a bit, but I seem to keep coming back to the ones that I know.
My bidding strategy seems to work and give me a steady flow of items to flip. Almost every time that I log in I have won at least 5 items that I can re-list for 100% or more profits.
Well, I'm off to give Inferno Act I a shot. Wish me luck!