Tips for shopping on Ebay?

I'm a photographer and am looking to upgrade my camera. I want to buy a Nikon D7000, preferably in a kit that comes with two lenses, a carrying case, and a memory card. I found a kit on Ebay for about $1, 200.
I've never bought anything off of Ebay before, and this looks pretty sketchy even though all the reviews I've read are positive. It's highly undervalued for a camera kit of its kind, which is why I feel it's sketchy.
Anyone have any tips or advice?
Here's the link to the camera, please if you think it's a rip off, let me know!
http://www.ebay.com/...1055737930

Don't give you details out unless secured line read all the data and if your not happy you can send it back but your only safe if you pay by pay pal