I book all the travel for our company and I never, ever use discounters. If you do, you are the first to get bumped if they need to bump someone. Your deal may seem great at first but you may be end up staying where you thought you would.
Prime example... we use the Hilton family of hotels and we are Diamond members. About a month ago, I needed to stay at a specific hotel that was booked up, thanks to my diamond number, I got a room and someone who booked on a discounter was moved to a different hotel. I know that sounds bad but it is how it works. Same policy applies with the airlines.
Your best bet is to work directly with the hotel website and call the specific hotel directly. Ask for the deals, they often have them available and ask for the rack rate.
You come out better working with the front desk at the hotel. My husband is in Houston monthly at least twice and I ended up with a corporate rate of $89 on a $200 room. Before I got the corp rate, they just wanted to match the price of a competitor.
Good luck