I'm tempted to say Arcee (or any fembot) but I'm not sure I would have appreciated it as much as I do now. Certainly my sisters would!

Windblade is more impressive, but obviously she didn't exist yet - she's not in the cartoon, so not sure as a kid if I would hang on to her. But she does have that awesome Japanese styling and an Autobot logo, so maybe I would have! My fav G1 was Skyfire, so otherwise I'm on board with Siege Jetfire.