I can think on only one now: Tera Patrick. Though it seems that the majority of Tera Patrick available photo sets were created solely for her website, whilst Silvia has done numerous quality photo sets for various website and production companies.
I heard that Angel Dark left the hardcore business, and is now running for modelling glamour sessions here and there. I noticed she appeared in some recent Onlytease.com pictures sets, that are not so bad. But will this new career be successful ? I don't know...
You're right, about successful example, i have only silvia in mind.