Looking at this article made me do a count up of mine (105). I have a goal to reach 150 by 2020, I personally think and hope I can do even better than this, but I looked at an average 10-12 new collections a year which seemed the most feasible.
I doubt there are too many on here that are past what Jonas has, maybe Tim Brown? (also worth noting that GWR apparently don't include aquariums and some smaller collections, and his total animal collections visited is getting closer to 1200).