Well, as to consistency being a criteria for First Growths, it's not like we haven't had poor Moutons, Marguax, or Lafite.
Is there any Cali wine that has always been on top of its game? Maybe MB. But if I had to name 5 top Cali Bdx-styled wines I'd like to have in cellar without knowing vintage, my choices would be
Ridge Montebello
Mayacamas
Heitz Marthas
Montelena
Corison
10-15 years ago hard to believe one could have this discussion without BV GdlT being mentioned.