I am pretty sure there are 20 to 30 more sets. For a time the editors at Marvel were busy with hookers and blow and didn't have time to exert control over their characters. During this time every writer and artist created their own set of armor with various tinker toys.
My personal favorites are:
Model 4 - The classic Red and Gold. Can't beat perfection.
Iron Man #126
Model 6 - The Stealth Armor. It had no weaponry but it sure looked cool.
Iron Man #152
Model 17 - A Red and Gold throwback to the original V cut face plate.