In Morrowind (GOTY), there were but two full sets of Daedric armor. And, if you didn't want to kill the almighty and 'essential' Divayth Fyr, you'd need to travel across the land and look http://www.uesp.net/wiki/Tribunal:Norenen-dur http://www.uesp.net/wiki/Morrowind:Druscashti http://www.uesp.net/wiki/Bloodmoon:Castle_Karstaag to find the second full set. Even better, who remembers just how obscure the location of the http://www.uesp.net/wiki/Morrowind:Tukushapal was? Now that was challenging.
I'm hoping in Skyrim there is an incredibly rare armor set that actually poses as a challenge for players to obtain. Doesn't have to be Daedric, though I wouldn't mind it as Daedric armor is a trademark of TES. Haven't they announced some sort of special dragon armor that's either heavy or light, and the best armor in the game? I thought I read it somewhere.