Great question!
Mine is Tamiya's Sdkfz 250/3 Greif.
It is a nice kit, certainly the best quality kit I had bought at the time, but more importantly, once finished, it was the first time I had built a model that I would proudly show to other modellers, (not that I ever have!) without feeling embarassed about my skills. I was that happy with it. All except Rommel's eyes. He looked....well.. a little frog like.!
As an interesting aside, my parents brought this very model up to me the other day, and seeing again it has ended a six year absence from modellling!