Thank you everyone for your votes and advice.
So this is what we are doing - I finally got the final quote from Designer A (the expensive guy). I am going to respond to him tomorrow and tell him about my budget and ask how can he fit a plan into that dollar amount.
In the meantime, I have also found 3 additional designers who have all worked at the Museum and I am getting proposals/quotes from them.
So far, I am finding great variances in prices. And of course, I will go with the person who has the best package for the my budget.
I was so gung-ho about going with Designer A because he totally had me imagining this lavish beautiful wedding. Sometimes, I can let my imagination get away from me!
So, thanks to all of you for calming me down. I am now exploring better options that better fit my budget.
It's exciting and scary all at the same time!