Source: marvel.wikia.com

2. The Model 9

After Firepower destroyed Silver Centurion during Armor Wars, Tony had to build a new armor, so he came up with Model 9, the Neo-Classic Armor.

Stark used this armor for a while during the late eighties and early nineties, and it made it through numerous events and changes in the status quo. Personally, I love the beautiful giant boots and shoulder pads on this one. It was big and clunky, but in a really charming and satisfying way.

When Tony was shot in the spine and paralyzed, he created a means to interface with the suit, which allowed him to walk again. This process eventually began to cause nerve damage, so he switched to a newer armor.

The suit survived numerous ordeals, including Atlantis Attacks, the doppelganger attack during Infinity War, confrontations with the Grey Hulk and Ultron, and a trip back to Arthurian times to fight Doctor Doom. Hell of a resume.