As we all know, 1.6 brought horses into vanilla Minecraft. It seems rather odd that you can deck yourself out in incredibly good, sometimes over-powered armor, but your trsuty steed is left to wear crummy iron/gold/diamond armor. The only thing I haven't really been able to decide is how this armor should be obtained. Dungeon chests may be too easy (especially if you have mods installed that add more dungeons to world gen.) But crafting the Nano/Quantum horse armor seems to go against the idea of horse armor being in dungeon chests. Bronze armor, which is really just for good measure, could easily go in those chests without being OP.
I'll leave it up to you guys to build on this idea and perhaps implement it at some point. Thanks for reading