I agree with Savannah and I feel your pain! I got engaged in april of 2008 and just finally found my dress. I went to 12 dress shops in calgary, edmonton, chicago, philadelphia and nyc-so I definitely looked all over. I never once had that feeling of 'THE ONE'. All the dresses were nice and i loved alot of them but there was never a THIS IS IT moment for me.
I finally decided to get a dress custom made cause I knew what I wanted, and apparently it didnt exist. As luck would have it, I went to a sale the day before I was putting down my deposit on my custom made dress, and found a dress I loved that was on for a ridiculas deal (seriously, I got it for $100). I still never had the feeling so many brides talk about, but it was a beautiful dress, that i loved on me, and it was $100 so to me, that was how I decided it was my wedding dress. If that dress had been full price, I can almost guarantee I would still be hmmm'ing and haa'ing over it.. Oh, and also, I went alone and bought it on my own. I found that when I went dress shopping with family and friends, I was relying on more waht they thought than what I thought.. and in the end YOU need to be the happiest with your choice.
Good luck, you will find something and dont fret if you dont have THE feeling, not all of us do!