Goodness, man, why? 🙂
Best thing to do is check the 'Bay a few times. I've tended to see GR1s' reach the mid-$200-to-mid-300 range (and 1v's a little higher than that), but, like many things eBay, it can be all over the place. Make sure you have lots of decent pictures of the actual camera, as well as copious description of its condition.
I have a GR1 (first version) that I won't let go of for love or money, but it needs a bit of work. Wouldn't mind a 1s myself. 🙂
- Barrett