Congrats!! I'm thrilled for you!
Be respectful and deferential with the future in-laws and hopefully things will smooth out with them.
Be patient when looking for the dress. If you don't plan to marry until Dec '04, then there's plenty of time to look for just the right dress at just the right price. It's not uncommon to find beautiful dresses whose designs have been discontinued at rock-bottom prices. You just have to be always on the lookout for it and ready to buy when you do.
Like Cindy, I'm here if ya ever want any help on figuring out all this wedding planning stuff. We did a beautiful budget wedding as well. (A hundred years ago! *LOL* Welll...13 years ago) My mother-in-law made my veil, and like Cindy said, she did it for just a few dollars, but could have sold it for a couple hundred, it was so beautiful. Hmmmmmm.....maybe I could get into the veil-making business??? 
Blessings to you and your girl!
Judy