Not sure how much to sell my Nikon D90 for

I'm selling my Nikon D90 including
18-105mm
50mm 1.8
SB 600
Battery grip(not nikon, vivitar)
and also going to include memory card, a year worth of insurance and my nikon bag.
How much should i sell all this for?

Look for ebay price, watch several d90 bid and see how much it sold for after bid is finish. I think it goes about mid $800, remember you selling a used camera, used camera won't had warranty. But you gonna take another 10-15% ebay fee, is best try to sell in crainglist, people sometime willing to paid more in crianglist over ebay since they can actually see the camera in person.