Ebony with a circlet and the Ebony Mail. I've never really liked in Elder Scrolls games how the top armours always look a bit 'evil' I guess. I haven't been bothered to calculate it but it's all been upgraded with 100+25 smithing so its probably at the armour cap anyway.
For heavy armor I would have to say Daedric... My nord has a full set of Daedric (legendary) armor, with a matching shield.... I just need two more hearts for a bow and sword, but no one sells them and I can't find anymore Daedra >C
For Light armour, my fav is the Nightingale armour, it looks so awesome
Yeah, I have that perk also. It's in the LIght Armor section. If you wear an all matching set, it boost you armor up like 30pts. For me Shouded(darkbrotherhood) has the highest with about 230, then NIghtengale with around 200 and Theives about 170. I also "smithed" these up pretty good.
I always carry my Theives chest armor for the increase of 30lbs strengh when my treasure hunting gets wickedly high. Nothing worse then having to drop shit in order to pick up something better.