Welcome to Basenotes, Chouquette! My favorite rose soliflore is Velvet Rose by Sonoma Scent Studio. To me, it smells like a freshly-opened rose covered with morning dew. SSS also has a very nice violet fragrance, but I still don't think I've found the perfect violet soliflore. I do adore Stephen Jones by Comme des Garcons, which is an amazing violet, but not a soliflore.
I'm sure you will get many other great recommendations here!