Ebony for looks, and protection, it has both in spades. Dragon preist Masks, because there's one for just about any build, and they have Enchantments higher than any you can make yourself. (Extra Extra Effects!) I generally mix, and match my own peicemail, rather than just go with a full set. Quite often with Master Robes of something or other, the Blades Boots/gloves match rather well, though I've also done Ebony, Nightingale/shrouded, or other sets to get the effect (Visual as well as magical) I'm going for. Orcish Armor matches the Masks' hoods the best, and has a cute heart shaped bustle in the back!
I actually wear clothes more than armor, they're lower maintenance (I don't have to do smithing) lighter, and faster than turtling up. I'll starp on a Shield, since Block gives you so much more for so many less perks, (50% Elemental Resistance, anyone?) My 2 favorites are the Targe of the Blooded for a Bash&Burn build, and Spellbreaker to completely block Dragon Breath (Even better with Ward Absorb to power Destruction with it!)
My ultimate favorite outfit (Pictured) is the Mourner's Dress (Female Avatar) Shrouded Hood, Jester's Boots, and Thalmor Gloves. No armor value, but as a fashion statement, it just screams "ASSASSIN!i1" The jester's gloves are too short for the sleves, but she's 2 handed, anyway, so the bonus is useless. If you're Male, then Ulfric's Clothes work just as better. My Nightblades wear Master Robes of Illusion with the Nightingale Hood, Shrouded Gloves (Anchient if you care about Armor, he's invisible, so doesn't) and either boots match all right. Illusion discount, Magic Regeneration, double Backstab, and Muffle, what more do you need? (Besides a decent dagger, and Invisibility.)
For Archers, the outfit is Linwe's Hood, The Gauntlets of the Old Gods, Master Robes of Conjuration (for Bound Bow) and whatever's clever on yer feet. The Boots of Running Speed, that's what I'd want if I could import them from Vvardenfeld. Instead, the Savior's Hide if I'm going non-magical, it doesn't line up with the hood as well, so maybe Krosis? The Ancient Shrouded Cowl matches up with the Nightingale Armor better than anything due to the high collar, in case you're more interested in Archery than Illusion. There's got to be so much more I've forgotten, but that's off the top of my head...