Stephen, it will be hard to find someone to help you finance the 10K loss. However, you're probably right that a $10K loss is not worth the damage to your credit. Do you have other assets which could be used to secure the financing?
Personally, I think any short sale where the value falls under $25K is not worth the damage to your credit. Even if you owe nothing on other mortgages, car loans, or credit cards, there is always the possibility you will seek new employment - and a short sale may make the difference.
There are always exceptions, but in Miami, we're seeing appreciation in the housing market, so if you can make the payments, you want to make sure that you're not going to suffer the credit damage unnecessarily. (The math in Jacksonville, NC will be different.).
If you can at least cover 90% your mortgage, consider leasing out the property.