G1 Megatron and Starscream. Still do not own either. I bought a reissue Starscream but it's just not the same...can't explain it really. Reissues don't do it for me and loose G1's are a crapshoot...i really lucked out on a few Dinobots and failed miserably with others, so...
Jazz was my all time favorite character. I ended up getting him in grade 6. Ironically, he is the only toy from my childhood that I have lost, but I still have the original box....go figure. When i went off to highschool, i stored all my transformers in a box in the attic. Except Jazz. I left him in my night stand drawer. I wouild pick him up every so often. Then one day I just could not find him. I am sure that one of my nephews took him, but I can never prove it
If there is ONE MISB figure that i would spend the cash on, it would be Jazz...most definatley.