I'm travelling for work for the next week and a half, so I plan to re-watch all the Star Wars episodes during my downtime. So the heated discussion: in what order should I re-watch Star Wars?

It's been about 15 years since I've seen Episodes 4,5,6 and I barely remember what the hell happens in Episodes 1,2,3.

I HAVE NOT SEEN 7 YET, NO SPOILERS PLEASE.

Right now, I've had someone convince me of this order and I want everyone's thoughts: 4, 5, 1 (optional), 2, 3, 6. 

What say you?!