For what it's worth ben seigel has a 975 gram spotnose for auction and it's already at 955 with almost a day left. Females with weight are virtually priceless as you cam make a lot of money of a single gene female by breeding it to the right thing.
A big spotnose like that is a tough one to price. Not a ton of people are into them but I think the prices suggested above sound reasonable. If it were me, I would put it up for sale for a little more than I was hoping to actually get out of it and see if you get any interest. Good luck