Wlad is just as hard to hit as Valuev. Wlad has a powerful fast jab, but Haye can win by TKO/KO.
Vitali has always been someone that I feel Haye can outbox quite easily. He is too open and wide. However he can hurt Haye aswell and I believe has more power than Wlad and if not, atleast he throws his shots with intent and tries for KO's.
Wlad is a technician and boring, but he has a style that is hard to beat if you don't have a great chin.