I've read reviews that say the 5100 is preferred over the 7000. I also like teh vari-angle lcd screen of the 5100. What am I not getting in the 5100 that I will get from the 7000? There is so much information!
I just recently "upgraded" to the 7000 from the 5100. Ability to use older lenses, 2 card slots, dual control wheels instead of going into the menus to change things like white balance, ISO, metering system, etc. Also weather sealing is a big part of the upgrade as the 5100 is very "plasticy" and the 7000 feels very sturdy. Commander mode is huge for me as I like to use off camera flash. This is basically the ability of the camera to trigger an external flash with the on-board flash instead of having to buy a 3rd party trigger system that does not utilize the TTL flash system that Nikon is well known for. U1 and U2 modes are nice as well since you can preset them to certain shooting types (indoor sports, outdoor landscape, etc) You get an increased frame rate as well so you can snap more photos continuously. 39 point auto focus as opposed to 11 points, so your focusing screen is much more "customizable". I'm sure I am missing a few things but these are just the stand out points that I am fond of since switching to the 7000. The 5100 is an outstanding camera though, since it is using the same sensor as the 7000, so image quality and low light capability they are on the exact same page.
Both would be a huge upgrade over the D60, but spending money on faster (low f number) lens would be a wise decision as well.