Improve sorting for Low  to Moderate network instances

I also removed the if-else, as introducing the new network instance could be easier, and it is likely there will be more network types in the future.

Happy to remove and simply add the if-else, if you would prefer?  

Before:
![image](https://cloud.githubusercontent.com/assets/446889/5321380/976822d4-7c88-11e4-8ad1-8588776a5663.png)


After:
![image](https://cloud.githubusercontent.com/assets/446889/5321371/8576d4da-7c88-11e4-8561-7204f11aee9e.png)