You only need nice cone wrenches in a shop setting since the cheap ones tend to wear/round/bend quicker due to being so thin. For annual hub rebuilds for the home mechanic, cheap ones that come in a $50 bike tool set work fine. Just don't try to abuse them as pedal wrenches. What will make hub adjustment considerably easier though is a way to keep the axle in place while you manipulate the cone and the locknut.