>>6179858U think you'd be better served in the Official Transformers Thread
>>6179639 if you want to maintain line aesthetics. This thread is for people who are in way too deep and are willing to pay hundreds of dollars for foot tall versions of Repugnus or Strika. You'll want to make absolutely certain Hasbro isn't going to make what you want before looking here.
As for your question, You may want to stick to the Generations line. Titans Returns is a subsection of it, and the line itself is a continuation of the Classics line from 2006. They're essentially modern interpretations of old characters, but since this has been going on for over ten years and through new design teams and budget constraints, the aesthetics can be pretty jarring despite being made less than a year apart.
I'd recommend Generations Springer and Sandstorm as an example of the line's highest point. Thrilling 30 in general has a lot of hits. Also be aware that Titans returns makes everyone a Headmaster, even if they never were before.
