I have two hundred and ninety-five ponies. (With four more on the way and three more swap boxes coming my way by December ... I'm sure I'll pass the three hundred mark well before Christmas!). Actually, if I count the fakie collection, customs, and the few doubles I have, it'd be three hundred and eighty something. Given the size of my want list, this is probably about a third of my desired collection...
However, I want to keep my MLP collection below 350 until I get a place of my own. That's my goal - to go no higher than that for the time being. (When I have my own house ... look out, ponies!) Which means I'll have to slow down my pony collecting, and maybe trade some of the ponies I don't quite like so much for ones I like better!
I think 350 is a good number, though. Big enough that it's an awesome-sized collection, small enough I can still remember who I have!
Skimble