All the armor (not including Nights of the Nine), then I got all the amber armor from Shivering Isles, and beat the main quest.
All of my armor/weapons were all enchanted and I just stopped playing. I may be able to get back in it, but as of right now I'm just waiting for this game to come out. I played through Oblivion once already, but I still need to play through Nights of the Nine. I should probably start that.