I usually book with Agoda. I've spoken with the manager of my hotel and he said that sometimes it is cheaper to go the agaoda route as the hotel does offer group/bulk pricing to them.
Hotel Name : Swiss Park Hotel
Date of Stay : December 2010
Girl Friendly : They say they charge, but I've brought a BG back with me twice and they didn't say anything.
Rates per night : Approximately $40USD per night.
Way of Booking : www.agoda.com
Review : Located on Soi 11/1, goo walking distance to Nana and Soi Cowboy. It is clean and has an in-room safe (which is something I require in a hotel)