Why do you want to invite entire staff? Are you close with all? Is it a small place? Do you socialize with them? Are there frum coworkers you are inviting and fear how it will look if you exclude the non-Jews?
About the blacks: Do you realize that you are trivializing your chosson’s feelings even before you are married? The issue shouldn’t be whether or not you work with non-Jews, but how you relate to each other! You both need some counseling or you’ll be wondering soon enough who to invite to your next wedding… plus looking for someone to babysit your kids. Tsk tsk tsk.