After playing around with the Spline IK method, I also found the progress along the path could be edited and animated to determine where the snake will be at set points in the sequence, which would prove very useful. Another benefit I have found with this method is that the actual vertices of the spline can be edited and animated, and no stretching will occur in the model's mesh, the path will simply be changed.
I created a simple test animation to see how effective this method of animation will be.
This has proven this method is probably the most effective for the results I intend to achieve. The only downside to this method is I am unsure how to rig the snake so I have control of the head. This is something I will look into.
