My favorite 4wt is my Sage VPS 9'. It is awesome and a "mid flex" as Orvis calls them.They dont make them any more but I am sure you can find one.. cost about $175 new, but you can probably do better as everyone was closing them out. Check ebay.
Or a Winston Vapor? Sweet rod and fairly fast. Steve sells them check http://www.thefullcreel.com
no tax and shipping is included at no cost.