My first team would be all about versatility.

Captain America has enough experience to lead a team and come out on top most of the time.

Crystal will add alot to the team. She can create fire, strong winds, or Earthquakes. She was only an Avenger for a little while.

The Vision has one of the best powers. he can go through walls or become as hard as diamond. He will be a huge asset to the team.

Ironman would be in the group because he is a genius and he is powerful, and that is good enough for me.

Wonderman would be on the team for some strength, I would have his new energy flavor.

Since all F4 memebers are honorary Avengers I'll put Johnny Storm into the mix. If he wanted to he could be one of the most powerful heroes in Marvel.

The last member of this team would be Giantman. He could add some extra srtength to the group and he could shrink. This would probably be one of the most versatile teams yet.