The boots do 15% sneak and the torso adds 15 stamina, however the Blackguard armor has the exact same texture but with 50 carrying capacity on torso and 40% pickpocket success on boots. Blackguards armor also has an extra 2 armor on each piece of equipment. My recommendation would be full guild masters armor with nightingale hood... Most baddass combo in the game imo
I would say Guild Master's armour and boots, Nightingale hood and Vampire gauntlets. The claws on the gauntlets look extra menacing :P Also, I don't know what skills you're taking but can I recommend the Skull of Corruption as a weapon? It has a really fast fire rate compared with other staves and can do heavy damage per second when filled with dreams.