hi there jackie, welcome to the forum. I made exactly the same jump last year, oly 510 to D7000. Never looked back! have a great time here on the forum!
Thanks I'm looking forward to exploring the site! The D5100 is absolutely filthy; so I will be taking it to be cleaned and tuned up. There is a Nikon service center around the corner from my job so I will be dropping it off there. I don't know if I can trust anyone else to do it.