My suggestions/preferance
Community Manager
Administrators
InnoGames Staff
Elder Moderators
Moderators
Senior In-Game
In-Game
These are the fundamental groups of moderating both in game and on the forums. A personal preference of mine is a definition between Community Manager and Admin's - that's not a necessity, just a personal choice. Elder moderators replace the default vBulletin "Super Moderator". At this stage the blog is a long way away and the wiki is barely used any more (.net recently removed their wiki admin for this reason), therefore, adding in colours for them at this time is pointless.
However, personally I find colours for staff to be practical and aesthetically pleasing, it makes it easy for a user to find staff members. As for banned suggestions, I don't agree with singling them out or "glorying" them for their offences. The word "banned" or "blocked" under their name is sufficient.