I was at that game in Miami. For me, that is easily the first/best touchdown that comes to mind.
Unbearable heat and humidity. Lots of people in the stands were having dificulty, even if they moved to a shaded area. The Patriots were without several key players on defense. A loss would have dropped the Pats to 4-3 a game behind Miami, and into a tie with Buffalo. The Patriots had already lost to the Bills in the week one "They Hate Their Coach Game", and looked stagnant in a loss to Steve Spurrier and Washington a few weeks earlier.
Ricky Williams and Randy McMichael both had big days for the Dolphins; a bit too much for the undermanned Pats defense. Fortunately the Marlins' infield helped the Patriots twice.
I was up more than half way, but I had a perfect view of the entire play. Troy caught the ball on my side of the field, in a straight line directly below where we were sitting. Fantastic, surreal finish to the game.
If I had to pick another I would say the first Brady-to-Moss touchdown, in the second half of the week one 2007 game at the Jets. It was like watching a Pop Warner game, except one player (Moss) should have been playing in a league two levels higher than anybody else on the field. If I recall correctly Moss hadn't played any preseason games due to a hamstring issue, so there were still plenty of doubts about his abilities. No questions after that play.