You know, you could go the route of IV, I, II, V, III, VI.
I mean the first two episodes don't reveal anything more than Anakin being like what the stories of him were. A hero, impatient, but still a hero and an ace pilot... It left the third movie to tell the story of how he became Vader. I mean II still ended with Luke's parents being in love, but no kiddos yet. Everything was still happy(mostly).
"I would rather be exposed to the inconveniences attending too much liberty than to those attending too small a degree of it." Thomas Jefferson