Hi, I have been collecting transformers awhile and thought to have some questions. I collected mostly lines starting from Beast war into RiD into Unicron trilogy, and now into HTFD, ROTF, Generations, and PCC. What I wanted to ask is for recommendations, as in, bots that you would recommend to buy from other lines that are just so amazing that, even if I am not collecting that line, these are "marvels" to have. I know I am missing some great lines, such as Binaltech, Animated, and Classics. I intend to look into classics but they only get worse in terms of price, so I don't think I will collect the whole line. Basically, what I consider as "marvels" would be a transformer toy that is well engineered. Homage does not factor at all for me. "Well engineered" is perhaps a loose term, but when you think about it, when you hold a toy that is an engineering marvel, you know it. The designers just have thought of about everything, and even the little details, amuse to no ends. Examples of "well designed" transformer toys in my opinion, would be Generations Bumble Bee and HA Jazz (which I do not have but intend to get even though I don't collect the HA line, I feel it is well done). For Bumble bee, when you think about it, the transformation packs very neatly, the weapons are all thought out, the figure is posable... you just.... know it was well engineered. It totally surprised me that a deluxe can turn into a scout sized vehicle, this thing is well designed, kudos to the engineers/designers that did it. With that said, I was just wondering if there are any "engineering marvels" that you diehardly recommend. An example of what is "not", is Fort Max. Everyone loves it, its a relic, its a holy grail, but I wouldn't say its an "engineering marvel". Optimus Classics, is one.