You'll have a good time with Nikki. She has a bubbly personality and is lots of fun. There is just a hint of porn star in her and that makes it really interesting.
As for other talent, in my limited experience you can't go wrong. Pick the lady that appeals to you and be nice to her and you'll leave happy. There are subtle differences and if you tell us what you like we could perhaps help further. I've only seen Krystal, Brooke, Natalia, Hailey,Victoria, Nikki, and Sophie.You won't be disappointed with any of them.