Alice Burdeu is probably the most succsessful winner.
She's appeared on numerous issues of 'Australia' Vogue including other Vogues' across the world. She's modelled for various fashion shows and has been signed by agencies across the world.
I also think Jaslene is one of the most succsessful ANTM winners, due to her drive and passion for modelling. If you compare her towards Naima, she's a real 'Top Model.'
Naima has only done a few modelling gigs here and there and I haven't heard from her for a while whereas Kahlen Rondot (runner-up, C4) has made it pretty well in the industry. She's recently appeared in a MaX Factor ad and is appearing over stores across Australia. She's also modelled other beauty brands, such as Revlon and I think Covergirl maybe once.
Saleisha Stowers was already pretty succsessful and her name could've been heard if she hadn't tried out for Top Model. She could have easily been signed with Elite before the show but now that she's won, her time with Elite has been reduced.
Elyse Sewell is also becoming well-known and despite appearing in C1 and completing it in 3rd place, she's become pretty succsessful.