My favorite designer would have to be anything under the Demetrios line. They are so simple yet regal looking.
However, I actually had my wedding gown made. (I was married in 2001.) There were 2 dresses that i absolutely could not decide between, because each one had an element that I totally loved. I remember remarking to my (then) fiancee - "I wish I could combine the two", and he said "Why don't you" - so i sought out a woman in the area that makes dresses. My mom's a caterer, so she has a few connections.
This is what we wound up with - and we actually had my daughter (from my 1st marriage) have her flower girl dress to match.