Which controller?

Hi i've had a printrbot simple for a while and have gotten the itch to build my own printer. I've chosen the OB1.4. it's a variation of a mendel prism. just about have all the parts I need except for the control board, I was wondering if someone could recommend one for me.
I plan on running duel extruders. Since I might go bigger in the future i'd like to get a board that I could use later. Should I stick with the audrino boards or wait for a smoothie bord to come back in stock again.



Thanks Jim