I'm not suggesting that you price your home at the average of the comps, necessarily, but it is a good place to start and then add from there with the extras that your home has that the comps do not. It sounds like from your comments that your home is superior to some of the other homes in the neighborhood, so you can factor that into your price. However, you shouldn't be priced too much higher than the highest recent sale. If you're more than 20% more than the highest price, people may think it is overpriced and not appreciate or recognize all of your upgrades. So make sure you highlight them!
If you are working with an agent, they can pull the last few months comparable sales. While your neighbor might have sold for much less, you might find the average sales to be better. Buyers will likely know the average sales price or average sales price per square foot as they look to put an offer on your house, so you should know that too. You can throw out a complete outlier that is not inline with the other comps (i.e. someone HAD to sell and settled for much less) and easily explain why that was not part of your comparable data in how you priced your home.
I am in Nashville or I could give you that information, but I am from the Memphis area and can recommend an agent if you do not already have one.
Your neighbor is being transferred, so he/she has a real motivation on moving. Your neighbor could have a back-end transfer package where his company will pick up all the expenses and reimburse the homeowner their equity. If that is the case, he just wants to go.
I am very familiar with the area you are talking about and it has gone through some obstacles: One, being or going to be annexed into the city which equates into higher property taxes. Second, lot prices dropped between more expensive neighborhoods and builders kept on building - making it much harder to sell pre existing homes versus brand new ones. Third, growth of the surrounding area with road congestion and commercial businesses. Then last, the national media effecting our local market causing a huge buyer's market (our economy is stable, we have low cost of living, low unemployment and the interest rates are extremely attractive) still buyer's are waiting to see what will happen instead of taking advantage of a golden opportunity.
Your neighbor may hurt the comparables, but realize this is only one sale and it was a less expensive home - I am assuming your's has more upgrades than theirs.
I would be happy to do a market update and see exactly what the totally picture of your neighborhood is really doing.