Morrowind Medium Armor Sets
Nordic Bonemold Dragonbone Dreugh Indoril Orc Adamantium Royal Guard
Medium armor is not that good. There are not many medium armor sets and, to make it worse, there's no medium armor master on the island. You would do better to choose light or heavy armor as a primary attribute.
On a side note the nordic armor is the weakest of the Morrowind super-armors, but it's still pretty cool to have ;-).
Official Site says:Also known as 'Great House' armor in Morrowind, bonemold is a medium weight armor affordable only by Dunmer nobles. Each piece is assembled from many pieces of softened shell, molded into shape, then bonded and reinforced with resin glues. The example shown here features a distinctive House Redoran gah-julan ('great-benefit') helm with the protective cowl deployed for ash wastes travel.
All three - in Tukushapal, Sepulcher
Cuirass: the traders in Caldera and Molag Mar have it.
Helmet: Molar Mag trader has it.
Shield: Calder trader has it.
Cuirass: The trader in Suran and Redoran Smith in Vivec have it.
Helmet: Balmora armorer and Suran trader have it.
Shield: Balmora armorer has it.
Official Site says: Indoril armor is the ornate heavy armor style worn by Ordinators, a military order of knights in service of the Tribunal Temple. Gold leaf details the pauldrons, bracers, and helm of this insect-shell laminate armor. So many Ordinators come from House Indoril that the armor style is known as 'Indoril' armor, though knights of all Great Houses may serve as Ordinators.
Official Site says:Based on High Elven designs, orcish armor is an ornate but remarkably light steel plate worn over cloth padding. Light and comfortable by contrast with other steel plate designs, orcish armor commands premium prices from campaigning mercenary officers and style-conscious nobles.