I was looking at the 2001 cobra and noticed the Bullitt. After weeks of deliberating and research (insurance, payment, resale, performance, options, technology) I then looked at 7 different Bullitts and drove 2 before making the decision. This was after narrowing the field to the mustang which also took several weeks (corvette, M3, WRX, BMW 330ci, Audi S4, VW GTI vr6, etc).
I guess I'd fall into the impulse purchase since I didn't preorder but that was the most drawn out impulse purchase of my life!