Have to consider this trading up from Shia LeBouf. I still have not seen Dark Of The Moon, but from what I understand that was a prety apocalyptic film, regarding the presence of the Transformers on Earth. Personally, I would like to see the next installment be set in outer space or an alien world, both of which are very common settings in TF comics and cartoons, but I do not think that is going to happen.
At this point, the TF fandom has passed me by, but I do still enjoy buying the "Legion" class (formerly "Legends" class) toys, which are the modern equivalent of the classic G1 Mini-Cars. Hasbro really supports this size with both regular Legion size (which are about 3.75") for "rank and file" characters such as Bumblebee, Ratchet, and Starscream, as well as Legion Commander size (which are about 5" tall), representing larger characters like Optimus Prime, Megatron, Ultra Magnus, etc.
At that size and price point, it's relatively easy to build up armies for both sides, and the toys themselves are fairly easy to transform and not overly fragile. I have quite decent Autobot and Decepticon forces at this point, so if my boys want to play TFs when they get a little older, we're good to go.