The KO has a rebate right now so I would go with that. Plus it's eVGA so you can take full advantage of the 90 day step up program. What an ingenious idea.
Note: some KO versions have been known to go bad or be bad out of the box. If you are not afraid to RMA an item then I would definitely go with the KO. But if you don't have time to potentially be bothered with returning an item, the regular version is the safer bet.