Asking price for a bike?

I've decided to sell my Mamba. I just don't know what a good asking price is. While the bike has been fixed and the brakes work, I don't think I could ever trust it again given the accident. Plus I have a hospital bill to pay.

I was thinking between 600-700 dollars. I paid around 900 for it, but I'm sure it's much cheaper. Do I need to go as low as 500?

I took it out for a ride the other day and realized I couldn't do it anymore. I know I'm not ready for a MTB trail for a long time.

Any help appreciated so I can put it up on Craigslist.