VIVID: 'Super American models with super silicone tits'.
WICKED: Also 'american silicone valley dolls'.
PRIVATE: Mostly Slavic, Czech and Hungarian, non anorexia-models.
Criteria for judging what good stuff is, is very personal.
Personally? I do not prefer american productions, the way they film most of the material is raunchy in my opinion and especially because i don't like to watch underweight barbie sluts, stuffed with too much plastics.
I prefer the Private Gold series and Private Black Label, high budget productions with mostly non anorexia models. (ok, the males return too often in other productions and they're not as hot as the females but Evan Stone and Alex Sanders remain my fav's.) Nikita Denise , Rita Faltoyano, Belladonna,
Julia Taylor, too name a few females from the Private stables. (some also appear on American labels.)
What in my opinion is 'good stuff'
rivate Gladiator- series, Scottish Loveknot, Cleopatra, Millionaire and the Private Tropical- series.
Just rent dvd's and start watching....
Good luck and i hope you'll have lots of fun!