One thing I do is goto the Chinese side of the forum(sex141) for actual pics of the hotel girls before deciding on one. Since all the pics on sex141 are ps'd. Some times you can see how big a difference it is.
There is some great info here. Reminds me of my time when I was in China and HK. I'll be going back again in Jan.
I still have yet to experience the Bigger KTV scene in CP or Shenzhen.
The pictures help alot in choosing but like over here. Always read the forum for the best reviews. They even have actual pictures of the wg so you can tell how much ps and airbrush they did.