Quote Originally Posted by Paulbot View Post
You could probably skip the Drift, Bumblebee, Ironhide, and Hearts of Darkness limited series. Ironhide's a good bridge between AHM and events later in the Costa series, but the others are pretty much unessential but have some selling points. (Except Hearts of Darkness. That's pretty much a mess.)
The Drift ongoing was trying to be something a little different, and it currently ties in rather well with the events of the second main arc of RiD, so it might be worth a read if you can borrow it or get it very cheap.

Ironhide mini was.... an interesting choice, but does exactly what Paulbot suggested. The events are ridiculous but did enable Bob to enter the IDW Mythos!