It is impossibly for me to say what was my first nirvana pony when I was a kid... I went to a lot of flea markets as a kid with mom, and found some nirvana ponies then... Probably could be Italian Bubbels or maybe Italian airbrushed Butterschotch.
When I properly started collecting when I was older, the first nirvana that I still at least have is the Brazilian Baby Gusty. I just love her, and don't think will be giving her up. She even has her accessories and the original packaging. ^^