Another thumbs up for Fantasy, been going there regularly for 2-3 years. Sometimes hit-or-miss with some of the cast, but new girls show up often and it's good to try them because most don't stay long.
Regarding Yukari, she's no-foreigners for work-related reasons. Which is a shame, since her English is very good. She's probably the only one where I'd take a longer course just so we could have time to chat.