I voted Starscream as I got him for Christmas in 85. He was the only one of the seekers that I could see actually working in the real world due to the other two's colour schemes (Skywarp's black and pink!).

Even now, I picked up the encore twin pack with TC and SW, but my fave reissue has to be the Takara book style Starscream.

And this is purely on the toy. His personality is just awful and I have no idea why Megs keeps him around!