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Reed & Sue ran from #300 to something like #305 or so. Writing that jogged my memory a bit (I think) because maybe Quasar joined as one of their replacements?
I don't know if you picked up...

Thunderstrike and Quasar were also probably post-#300 also

Since Issue #300 (Reed & Sue)?
Sheesh!
Off the top of my head:
Justice & Firestar
new Captain Britain
Silverclaw
Triathalon
Ant-Man (officially)
Jack of Hearts
Moon Knight (West Coast)

Spider-Man served a very short stint in the early 300's, maybe around #315,

Daredevil astonishes me the most because it has always been established that working in teams clouds his senses.

Vision & Witch not still married. She was with Wonder Man for quite some time, which make sense as Wonder Man's brain patterns were given to the Vision: Wanda fell in love with Wonder Man's mind in...

Two clues as to why I think Pym might be the heavy of the story. Scott Lang's death (what a waste of a great underutilized character!) was by chance, but he, Vision and Ultron all have direct...

The list of four was released by writer Bendis or editor Brevoort.
I never found Wasp boring, maybe because I started reading Avengers during Stern's run and he had a good handle on her.

MY...

My first guess is Hank Pym. He's been getting no respect lately. But also strong in my reckoning is Janet Pym.