I was watching the video for the transformation of new Deluxe Ironhide (due out soon I guess) and it got me thinking of what Transformers I'd buy for the 3rd Michael Bay movie.

I think I will go a size smaller and get:

Del. Ratchet (available now)
Del. Ironhide (coming)
Voyager Optimus (thing is - the rumor is - that Prime will look different in movie 3)

I think for scale, they'd need a Scout Class Bumblebee, Sideswipe, Mudflap, Skids, and Jolt.

For the Decepticons, Voyager Class would work on almost all of them, but you never know if they'll get a new look, too:

Megatron
Starscream
(a helicopter at long last - now Voyager Class Grindor would work, but...)
Deluxe Soundwave
Voyager Bonecrusher from the first movie would also work for scale...