Paul Pierce certainly has a playing style that ages well (never exerts too much energy, can beat you off of the dribble w/o going 100 mph, etc). Can't quite say the same about Iverson, though if he had remained in Philly and never had to play in Detroit for a year things may have gone differently for him. Two of the most exciting players to watch from that era, along with Vince Carter, T-Mac and Kevin Garnett.
There is a highlight video on Youtube of Allen Iverson (Philly era) putting up 33 and helping the 76ers beat the C's in triple-overtime so there have definitely been some great games between those two - whether on the All-Star team, the US National team or as opponents. It would be nice if AI could play for the Celtics with Rondo and maybe Nate before it's all said and done - as a bench scorer for only 3 games with the Grizzlies he was very effective and efficient and is a great passer/playmaker.