I went with:
1+2: the 2 dives (Eddie and Pierce) - in both cases, our guy was on the floor while theirs stayed standing. Plays like this made it obvious who wanted it more.
3: Garnett's steal from Wally, if only because of the full play: Garnett switched on LeBron, completely stonewalled him, jumped onto Wally on the pass, snatched the loose ball after Wally dribbled it off KG's leg, got clubbed in the back trying to dunk, and hit the floor laughing. Sums up KG pretty nicely, I thought, except I would've rather he made the dunk (or both FTs).
PJ's jumper was huge and Pierce's FT was nice, but neither was as fun to watch for me as these 3.