My own cut-off date had been around the end of the Korvac saga when Perez left for the first time, but I'm thinking of extending it through the early 200s since Perez came back for a few issues around then.
But I want to avoid two things:
1. the whole Hank Pym debacle, which I think happened somewhere around there - never read that and no desire to do so now.
2. the story where Moondragon goes nuts and enslaves a whole planet via mind-control - that was the ruin of what could have been a good character, for me. This one I have read - hunted down the back issues when i first heard about it just to see if it was as bad as it sounded - and don't want to re-visit.
I'm curious now: what are the essential Avengers eras for all you Avengers fans? I've never really thought about going beyond 175 until recently, but maybe I should since I know a lot of people here whose tastes sometimes coincide with mine like the Roger Stern era, for example. I should also try the Busiek/Perez run some time, but that's more recent and something I've meant to do for a while now.