I personally do not care for Member status, Post counts, Stars Avatars, or even join dates. If there is an option for a member to deselect these for themselves, I vote to activate this feature.
When I log in as a Staff (elsewhere) My username presence is the same as everyone else, not bold, not in italic, or different color. Just in real small letters, underneath is "Staff".
That said, I like simple, and I do not like for members to feel intimated. Many folks have been members for a long time, lurk a lot, and when they do share, one is often wise to pay attention. I use :
Member 0-15
Jr.Member 16-30
Sr.Member 31 and above