Damn, those are definitely some tough ones! Powered Convoy QQ
One of the biggest purges was my Movie Trilogy collection, and I never really looked back on it. If I want to get back into collecting it, I'd probably start at the Human Alliance class and go from there.
I'd say I definitely miss ROTF Leader Optimus Prime and the lovely 2007 Takara bikes.
I also had to get rid of Bludgeon with the HR upgrades. Regretable, but alas, it just didn't really fit anywhere in my collection.