I am assuming this all affect and takes part in IDW in my choices:
Safe, easy, reassuring G1 childhood me says

Hound would be the best fit. May be a boring story if its all just good guy status quo stuff, but hopefully, since he was with Getaway's group he is as not ok with Megatron being a "good guy" as I am, and would put a stop to forgiving everything he has done(but the ride to Megatron's re-thinking of himself has been awesome). Probably my Honour choice.
My Order choice, I suppose in my imagined IDW story, would be

Star Saber. His religious zealotry would create his kind of order. Maybe Pharma will come along, Circle of Light stuff and he will put on end to "factions". Some people may consider that Chaos though. Like Obi-wan says; we find that many things in life come down to point of view.
Chaos, or maybe Order, again point of view choice would be

Deathasarus. He is like lots of people have posted here a good leader, cares for his charges/troops and a loyal, to the original IDW Decepticon ideology, Decepticon leader. Leading Cybertron in that capacity would rub lots of poeple the wrong way and cause chaos.
Out of those my ultimate pick for IDW story reasons is Star Saber. As I understand this doesnt have to be a Prime that is divinely chosen as what is the ultimate, good, honourable choice of Primus. They can craft the story to fit and everything can go back to status quo, story and character wise in a couple months or years. I like fun, interesting Transformer stories and this could open plenty with lots of the choices.