A lot of those sites replicate the girls on here. Seems like EI have taking the content over in some fashion.
Most of the others are not very reputable. Only EI and IIE are in any sense trustworthy as far as I'm concerned.
Adultwork is an excellent site too but not for domestic Irish stuff I'm afraid.
Personally I think EI is comfortably the best of the lot. The forum is light years ahead of anything else out there and while the girls advertised is not as tightly managed as IIE I think it errs on the right side.