Okay, I've set the first battle.
SPI armor is like MJOLNIR armor, but for normal people.
It's not nearly as tough and does not augment their strength by much.
SPI MK III armor is something I made up. Halsey built this armor to be more combat oriented, but it's still pretty weak compared to the other armors.
http://halo.wikia.com/wiki/Semi-Powered_Infiltration_Armor
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A 7ft tall monstrosity of brute force that follows orders...