Source: marvel.wikia.com

9. The Model 42

The Model 42 was introduced during Marvel Now!, and existed to test out new tech in the Iron Man.

For example, the multiple repulsor cores were spread throughout the suit, giving it a better overall energy output. Also, I really liked the suit’s yellow and black coloring and its beautiful red highlights. The bumblebee might not have been beloved, but it was a great new direction that was still clearly Iron Man.

The suit was occasionally used remotely from space while Tony was there with the Guardians of the Galaxy. The suit's main improvement was its modular nature, which allowed pieces to be swapped out, depending on the mission. This suit was the subject of several key stories.

It stood alongside the rest of the lineup for the formation of the Avengers during the Avengers World era. It did combat with the heroes of earth during Infinity. It investigated the death of the Watcher and fought the Hulk during Original Sin. Overall, it was one kick-butt suit.