I hesitate to ever use the term "best practice" as things highly depend on the situation. That said, there are definitely some documented ways to do things that make more sense than others.
Here is a post I wrote on how to configure lab networks that can easily apply to any network. It covers a 2-NIC and 4-NIC layout, which are rather common in today's world of 10 GbE or a pair of dual port 1 GbE cards. If you have more NICs than 4 you can just further divide out the non-storage traffic.
http://wahlnetwork.com/2012/07/16/efficient-virtual-networking-designs-for-vsphere-home-lab-servers/
Hope this helps.