Traitor's requiem and Sono Chi no Sadame are good. I agree. But the time stop in Sono Chi no Kioku was the first time any anime OP had done anything like that. No one was expecting it and then Dio- I mean "DIO" comes in and says "ZA WARUDO" and time stops for exactly 5 seconds and all we hear is DIO's footsteps as he walks past Jotaro and then time resumes and they brawl it out. That is the most epic scene in any anime opening.