If you could replace just one Autobot and one Decepticon from the movie with a different character who woulld you pick. I would take away Jazz and replace him with Prowl(seeing a good copcar bad copcar fight would be cool) and I would replace blackout/vortex with blitzwing.
I'd replace Bonecrusher with Swindle, Barricade with Blast-off, Scorponok with Onslaught, and rename Blackout his proper designation......Vortex. That's right folks, make no mistake as to who I want to see make a bigscreen entrance. [Starscream]Combaticons, merge into.....BRUTICUS!!![/Starscream].