If you need a referral of a top Realtor in your area I would be happy to provide one. My advice is that you need the information requested from a professional who knows three things:
1. Your home
2. Your personal situation
3. Your local market trends.
You are welcome to contact me via my Trulia profile if you need help.
Another moethod is to scour sites such as this one- Trulia and Zillow- there are many sites that provide value information- best to talk to a local pro.