When it comes to new girls vs established girls I tend to see established girls. I would also see some on a regular basis, I'm not really into the visit only once and never see them again idea. It works for some lads but not for me.
Because of this I don't really see why I would stop seeing a regular girl for a new unestablished girl. I know I am probably being unfair to a lot of the unestablished new girls on E-I as everyone has to start somewhere and won't become established unless they get plenty of visits but so far my method has worked nicely for me so I don't see the need to change it.