Garthanos
Arcadian Knight
As someone else posted, combat in Conan isn't very swingy at all: Conan tends to kill everything he strikes at with a single blow.
I don't think classic D&D emulates that particularly well at all, because eg werehyneas will tend to have at least 2 or 3 HD, and hence not be liable to be killed by a single punch from Conan's fist. 4e's minion rules actually come closer to this feel.
Even 4e's minion rules are not quite up simulating that (minions are a bit dangerous)... the battleragers original rules would actually work to do the Conan effect though