:O!!! I've apparently surpassed 1000. I keep spreadsheets which are probably like 99% accurate (lol), and I've just totaled up my collection. Between G1 and G3 I have exactly 1000! Then an additional 10 G3.5s and 13 G4s.
This does include doubles (of which I have....a lot), and ponies in my sales, but I never count anything except standard brushables - so I don't count Seaponies, Ponyvilles, Breezies, Blind Bags, McPonies, definitely not plushes...oh, and not my one Dream Beauty. =P