Abby Winters - natural girls, based in Australia, solo and lesbian
Andrew Blake - stylized and gorgeous, some are just women, some have some bdsm
Viv Thomas - more story than most, some het. but mostly lesbian films
and also what other people said, Pink and White Productions (Crash Pad) and Belladonna (Strapped Dykes) are good for more butch-y (dyke-y?).
I also like some yuri (=lesbian) hentai (=anime porn)..but not anything in specific.
It is true about the lack of good lesbian porn. a common frustration among queer women I think.