From Yandell's articles:
3/3: Sampras, Henman
3.5/3: Federer, Ancic
4/3: Agassi, Safin, Blake, Kiefer
4/3.5: Gonzo, Nalby, Coria, Hewitt, Ferrero, Kuerten
4/4: Roddick, Robredo
4.5/4.5: Nadal, Grosjean
Brilliant articles explaining grip and how it dictates your stance choices and what balls you can hit back.