A very average damage I see, which is effective in hell, is 6k-7k... most hammerdins I've seen get roughly 9k-11k... I myself have 12k, but only use 3 combat charms and an annihilus... aside from that, it's all cookie-cutter gear. With more combat charms, I'm sure 14k-15k is achievable...
I've never really heard of more than 14k or 15k, though... and that's overkill... then again, so is my 12k damage. :uhhuh: