Welcome and congrats!! I have been with my fiance 8 years, so I know the feeling . I was overwhelmed picking a location too, but contacted a travel agent that specializes in destination weddings, told her my vision and budget, and she recommended some great places. We also researched ourselves to make sure we are getting the best possible deal... We actually got more affordable room rates on our own, but when I told her, she matched the price.
Good luck!