When I wrecked my CB360 I took it to a Honda dealer and they worked with the insurance company to figure the worth. They called me back and asked if I agreed. If not, I would have to find someone else to appraise the damage, etc. The key is to make sure whoever is doing the appraisal knows exactly what was "good" before the accident. Give them a list of what you see, every scratch, dent, oil leak, and noise that your bike makes. Tell them that before the accident, everything was immaculate.
Edit: I see, you're getting the apprasal so you can get the insurance, not for a wreck. My bad. Just make sure it's really clean and shiny when you take it in. In my experience, a lot of the insurance guys that do the appraising don't really know the ins/out of bikes. So make it nice and shiny and they'll give it more of a value. I got $1500 for my wrecked CB360.