I have go to Crazy House on my first day and last day at Bangkok (5 days trip). I would say Crazy House is the naughtiest bar in cowboy, the girls are beautiful, and with different style, the customers are half Westerners, half Asian. The lady drinks are a little more expensive (330but), but it does worth.
I have meet a cute and nice girl there,she looks like a Japanese school girl at first glance, with a lovely smile. We have some drinks and the routine rundown, and we exchanged contacts.
On my last day at Bangkok, I re-visited the bar, and this time we go out to a live band bar, have some drinks, listen to the music, and play snooker (and I win 300 but). It is my most enjoyable time in Bangkok.
Crsay House is a must go, and remember you respect the girls, you will be rewarded, be nice to them.