My favorites on Red Light are Kandi Kay and Amy Lu Bennett, plus new girl Rocha formerly of Babestation is a good addition. I haven't seen Rachel Taylor for a while, but she's another who's at the top of my list.
Rachel Taylor's always on! She's one of the Red Light stalwarts, along with the likes of Lucy Zara and Dannii Harwood. I've heard that Rachel often fills in for other girls, if they don't make their shifts for whatever reason.
I think Red Light Central and Playboy TV Chat have a lot more variety in their lineup than some people suggest. Remember they have girls like Shanti and Priya, Ella Jolie and Charlene Hart, Tammy Oldham etc.
With 4 channels a night I'd say that Red Light is now the major channel. Studio 66 have 3 but aren't always using them and Babestation has 3. Plus Red Light has the first channel, 902 at the top of the list.