Iron Man matches for the most part are all awesome (the ones that have aired on TV, never managed to watch the house show ones out there between the likes of Bret/Owen and Bret/Flair). Just HBK/Bret and Cena/Orton trying to bring the rest down
Rude/Steamboat (30 minutes) in 92 is a tremendous fucking match.
Angle/Lesnar from 03 is one of my fav Iron Man matches.
HHH/Rock from 00 is incredible too. I was entertained for SIXTY MINUTES with a ROCK match. Now that's something!