Nylon Jaw Pliers are a must for straightening wire. These have high quality nylon jaws which will not damage delicate wire. Made from stainless steel, these pliers are box-jointed and have comfort grip handles.
I love these pliers for straightening both small and thick wire. If you even wanted to slightly "harden" your wire, run it through the Nylon Jaw Pliers a few times, squeezing tight with the plier and swiping the wire through.