Let me preface this by saying I want to sell my camera on craigslist to buy a nikon d90 primarily due to the focus motor. I want to know what my current set up is worth so I can gauge how much out of pocket I need to be.

My current setup is a nikon d50, 18-55 lens, 55-200, and 70-300. I also have a sb-600 speed light.
I might want to hold on to my speed light.

I have been meaning to get a 50mm 1.8 lens for my camera and stumbled upon this on craigslist. I figured I am better off selling my current set up buying this setup.

Is it accurate to ballpark my camera with 3 lenses at around $250? Is that setup I linked seem to be abnormally low for $500 or about average.

http://miami.craigslist.org/brw/ele/4416062816.html