Yes, I have. I don't think there's a more perfect breed than papillons out there. Their temperament is just fabulous, I've never seen more loving happy little dogs.
That said, I'm still going to own a few more breeds in my life. A lot of breeds (particularly the herders) really really appeal to me as well. Perhaps I'll find a second heart breed, I don't know. I'm obsessed with border collies.