Probably Alexis Love. But Lily Thai is definitely a contender. Runners up would include Ana Ferrari, Angel Dark, Piper Fawn, Minori Aoi, Sora Aoi, Maria Ozawa, Lela Starr, Veronica Zemanova before she had multiple implants, Kobe Tai 10 years ago, etc. But I definitely think Lily and Alexis are my favorites.
I tried to set up a shoot with Alexis but it proved too complicated as they wanted to see a business model and some evidence that I had a site in the works and I don't really know html at all. I guess if I was really serious I could have paid someone to work up a basic site for me and I could have fudged the plan. Now it's too late as her agency doesn't hire her out for hardcore B/G scenes anymore. Missed opportunity... sucks...
Brittany Stone would be a more realistic alternative since she sometimes works as an escort too, and not even a very expensive one. Over in eastern Europe though and I don't get there often. Locally I've seen both Kapri Styles and Lacey Duvalle offer escort services. Lacey has gotten ass implants which I think look disgusting and she charges way more than I think she's rightly worth, Kapri on the other hand can still be had at very reasonable rates and I even tried to make an appointment once but it ended up getting cancelled.
The only porn "star" that I have had sex with that I'm aware of is Ashana from exploitedblackteens.com. and also some girl that goes by "Bird" who is on her own alt-porn lesbian site.