Definately get the corsair! Like said above, the OCZ will have poor timings compared to the corsair. Memory settings have a bigger impact on performance than you'd think. For the FSB speeds that I imagine you will use, the corsair will give you much better performance even though the OCZ has a DDR433 rating.
Kingston HyperX is very competitive to the corsair and the prices are very similar. In my opinion, OCZ = poo, especially the mid range OCZ that you are mentioning.
Whoever said to get the OCZ needs to get hit on the head with a tac hammer. It would be good if you were on a tight budget, but comparing performance isn't really a contest.