I would think the Mini200 would give you a bit of play room in your stocking compared to the 180, however since they're bubble kings you could probably go with either or and not have much of an issue. I'm guessing budget isn't much of an issue if you're willing to buy a 1300 dollar skimmer.
Personally I would go for the mini200. I wouldn't worry to much with over skimming, I don't think you'll have much of a problem with it.