I already have some figures, I'm trying to keep all my figures on a scale when it comes to size, such as the reason I'm getting titanium Optimal Optimus is cuz he's smaller than the others and him being a maximal naturally means he's smaller than either Autobots or Decepticons. I already have Classics Optimus Prime and Classics Megatron, am planning on buying Classics: Starscream, Bumblebee, Ramjet, Grimlock, Astrotrain, Jetfire and Skywarp. I plan to set up battle scenes and I want everyone to be on scale so to speak. I don't want a minion to be bigger than his leader, unless it's someone like Cyb Metroplex or Superion Maximus or any of the other gestalts. So most of the figures I'm gonna be collecting will be from Energon, Cybertron, Classics and Titanium. Hope this helps in the suggestions department.
I'm also looking for characters that are decent reincarnations of G1 characters or really good homages, hence why Downshift and Shockblast are on my list.