Delph is a good option and maybe Westwood as vice-captain.
This for me.
Despite Guzan being a good shout, I've never been keen on goalkeepers being captains, has to be an outfield player. Neither am I keen on forwards being made captain either.
Delph has given us all a massive boost and shown his commitment to the club - his example will hopefully inspire others, a good captain isn't just what they do on the pitch but off as well.