That is a tough one, although this may come as a surprise to most of you, Rui should get the spotlight. Without a doubt he was DA MAN of the match. Yes, Figo started the rally, but Rui took it and ran with it.
I say go with Nuno - he really had a hat trick, and I've had a few e-mails over at Benfica Central from people wanting to know more about him since his performance versus England. Even in the Euro 2000 forum - some guy was asking where he played. I think people want to find more about "Gomez".
Conversely - most people already know Rui Costa, and it might be better to promote someone the general public doesn't know. I would also vote for Xavier or even Vidigal, who I think had a pretty great game and has been overlooked. Particularly his Algarve-sized balls he showed making the goal saving tackle with 12 minutes left in Baia's area. If it wasn't a clean take, England could've easily gotten a PK there. I thought he played great.