Typically, the versioning has some meaning to the programmer. Increasing the major number might indicate large changes that prevent backwards-compatibility. Other numbers in the version number might indicate smaller feature enchancements or bug fixes.
If you are worried version 0.6.5 has an incomplete ring to it, you might want to market it under version 1.0. Your marketing version number need not match your internal version number. The version number of Windows 7, for instance, is 6.1.
My personal preference is to start from 0.1.0 and go from there.