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Buy the one you're more comfortable. Its really a personal decision. There is no right or wrong answer. Its you're money and your decision.
 
Buy an iphone 16gb refurbished online at $79+ tax online or
Buy an iphone 16gb brand new in-store, today?

If you can I would wait for the next model to come out in June and buy that one, it's only a few months to wait, just what I would do
 
If you're going to keep the phone for a long time, go for the new in-store. I don't know about refurbished warranties, but if you get a new one you're guaranteed one year of protection and 90 days of phone service.

And you can buy the extended AppleCare Protection Plan, too. :)
 
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