I've got 3 at present: a 12" dob (originally bought a 10" but I 'upgraded') then the ETX-70, now recently a 114x900 reflector (so far unused, looking for a mount for it).
I think though in reference to the question of how many scopes is enough I can see that will always be "at least one more".
Once I get the little reflector mounted then I'd like to get a PST in the next year or so (definitely prior to 2009/2010 anyway), but down the track I'd also like a much larger dob, maybe a nice ED80 for widefield viewing, etc.
I think this telescope owning thing is a VERY slippery slope once you start in on it. Bot SO much fun!