Hi,

I don't know as though I'm an expert but from 
what I've seen on the current market for similar 
Belldandy's as the URL you provided, you're 
probably looking somewhere in the area of $1000-
1500.  Depending on how much the owner spent on 
it originally and what kind of profit they're 
looking to get it might even be slightly higher.  
Hope this is somewhat helpful to you