0 - Cloud Car! I remember liking it a lot as a kid. I think it was due to it being bright orange (compared to all the gray ships up til that point) & its unique shape. The Cloud Car was colorful, organic-looking, fast, and sounded like a race car. Perfect imagination fuel for a kid my age.
Side note about the Nebulon-B: I liked it but I've always felt the design was kinda silly for a warship. It's a stack of cylinders & stretched pill shapes connected to engines by a pipe that screams "weak point," you know? I wonder what the ILM guys were thinking when they threw it together.