I'm 6'0" also and my axe is a 70cm Petzl Snow Walker and I'm happy with it. My buddy's happy with his BD Raven (a bit cheaper I believe. Either way I don't think you could go wrong and I do agree with buying new (or used sight unseen).
"Get Busy Living or Get Busy Dying" Andy Dufresne, The Shawshank Redemption