The One-handed perks i get are as follows:
The 5 Increase damage by X%
The one that lowers the amount of stamina used for power attacks
The decapitation one
The two that increase dual wielding speed
the one that increases dual wielding power attacks
Personally, I hardly ever use a shield, and have yet to actually put perks into it.
Those are the exact same perks I take for dual wielding characters. For my nightblade, I am taking all of them except the three dual wielding ones. I don't have a dedicated sword and board character but both my dual wielder and my nightblade make good use of a shield unperked because of the bash that can stagger opponents and interrupt spells. The nightblade uses shield more than the dual wielder (obviously), but even my dual wielder will pull out his magic resistance enchanted shield to deal with mages. They don't typically have enough health to merit dual wielding and the shield bash interrupts their spells quite nicely.