Best idea will always be to reveal Vince's old purple uniform and same shoes and perfectly re-create one of Vince's finest from his contest win. Buzz one is just revealing the uniform. Buzz 2 is anticiptaion of which one he will perform and buzz 3 is actually pulling it off.
Vince is the dunk contest benchmark and it has more value to Demar than any other, being a Raptor.
I'd aim for dunk #1