A couple of points:
Look at the link below - the average price per square foot dropped 7.5% in a year, so if it takes three months to sell, that is a 1.9% loss in value. The average listing price is $296K, so that would be $5,624.
Know that in most markets the BEST Realtors (in the top 20%) sell a home in 30 days, when with escrow requiring 55-65 days, that is already three months. Selling in a buyer's market, with many foreclosures and lots of inventory, chances are it will take you longer that three months to sell. At six months, 7.5% divided by 2 (half a year) times $296,000 would be $11,100 which is 3.75% of $296K.
The point is that if it takes you more than six months close escrow, the ONLY way you will make the most money is to list with a Realtor...unless you don't really need to move. I suggest having a few top Realtors analyze your situation, compare their proposals, then determine what is best for you.