$100-$150, since reguardless of how it's modded you can easily bring it up to date.
For me what would strongly effect the value would be how good the battery is, as it's $30-$40 to get a replacement. So if it's well worn out and it could very well be, being a fat model, I'd value it less due to the need to buy a replacement to make it useable for more than like, 30mins.