XL100. Dunno why anyone would lust after one of these... I guess being surrounded by Honda 4-strokes had an impact on my naive young mind - but unlike the trikes, Z50s and CTs that we had, the XL looked like a real bike. I've got an SL100 now, which is close enough for me.
87 CR125RH - I read all of the magazines - they were The Best 125 in 1987, they were a Honda, and they looked damn sexy. Oh yes, I wanted one for sure. Funnily enough, even when they were just an old bike (and I was over 16), and there were newer models to lust after, the CR still rated. Got one now.
80 YZ125G. Saw one at the Bike Farm in about 1990, and figured that it was the right mix of performance of price (working roughly one day a month for $4.40/hour didn't leave much disposable income...). Got one now.