Highest they go used to be a level 9 for terminal, changed it about a week ago to level 8 being the highest you can go. Enroute has no limit.
I would seriously not try to guess what will be on your list because they use their own methodology. They consider staffing needs now, in the near future, future retirees, etc.. Also if someone in a class ahead of you fails some of their facilities will be passed down to you. There has been anywhere from a 6% fail rate to at least a 34% fail rate that I know of, maybe higher, so you have no way of knowing for sure what will be on yours. This is all terminal numbers, enroute still has a very high fail rate.