Pound for pound, the best Avengers line-up ever:
But aside from the slight redundancy with both Wasp and Yellowjacket, this is about as nicely-balanced a set of powers and personalities as you're going to find.
It didn't last terribly long...Wonder Man came in almost immediately, and Thor kept showing up intermittently (part of the Collector's machinations). The began the Michael saga, and the (real) Guardians Of The Galaxy came, along with practically everyone who had ever been an Avenger...
And whatever your opinion of that team above is, you have to admit that it's 450 times better than this line-up:
From Avengers #151 (1976) and Avengers #300 (1989).