Thanks to all for your comments. Looks like I will be getting the D7100 after I get back from Hawaii. I'm contemplating on whether I should keep the D5100 as well or sell it on eBay or Craigslist.
@fotojack. No fascination with FX cameras. A couple of my friends are convinced that a FX camera takes better pictures since they are more expensive. I really think that its the person behind the camera that matters.
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If you don't need the money, keep the D5100 as a backup. A lot of us around here have both, some carry both with different lenses mounted so they don't have to change the lens.