Based on these prices it sounds like regardless you were better off waiting on buying the system unless you really wanted those ambassador games to play for yourself. Maybe when updates come out for the ambassador games, if they ever do like they were supposed to, prices will go up again. Then again I don't know if all the promised updates already came out for those games.
The people who bought the system used with the ambassador games still paid less than someone who bought it at retail even at $200 but then I don't know how getting that system over to another account would work, and if there will be any additional benefits in the future to having an ambassador system that is registered under your own account.