I would suggest Blender. Yes....I know...most people hate the interface or think that it is too difficult, but it has been growing a ton in the last few years. If you invest a little time and do some tutorials, you can do amazing things. It has a pretty decent sculpt mode (ala ZBrush) and is a very capable subD modeler. Oh...and it's free.

Once you learn the workflow in Blender, you'll be very satisfied that you put in the effort as it is a very fast program to work with.