I've only just recently decided that I am going to start an MP collection of favs only (I do possess the will power, lol).
Of the 3 choices the slight edge goes to Magnus for me just past Wheeljack. Although I will be getting all 3, Magnus is the all-time fav of the 3. I don't know what exactly it is but even as a kid the toy was just all kinds of awesome and now that he is getting an amazing MP treatment it's just sweet music to my ears, lol