Congrats on the upcoming nuptials. I've been married 35 years, and counting. I'd do it all again.
As for the hotels, my best suggestion to you would be to attack it methodically with a spreadsheet. Make a list of all the acceptable hotels that are close to your wedding and reception venue. Then, just start calling. Ask to speak to the Group Sales manager.
Then, get a quote on what they are willing to do for you. Chances are some hotel will pop out of the crowd by offering a better deal that the rest.