4 revs plus one on order, but one of those 4 is a Backtracker which I never fly. So I don't know if you really want to count that one, it is a Rev in name only and part of their history.
1.5 Full vent-1
Backtrackers absolutely count. I'll put you down for 5, let me know when the new one shows up and I'll bump you to 6.