Dress #4 looks alot like my own dress (the maggie sottero paris royal). It also comes with a few different skirt options. I LOVE It (obviously) but I ended up taking off the broach.
I absolutely adore the first and 3rd dress on you. I think it is the top of the second dress not fitting right in the photo that turns me off from it on you. Also, I dislike how the dress fabric ruffles horizontially and even appears to be a different color and fabric then the top and bottom of the dress.
I would have to see a full pic of number 4 to judge but the top looks nice. Based on the other dresses, you may have more elaborate tastes then I and the top might be too plain for you (even with the sparkle). I like how the dress cuts diagonally from the bust to add a little bit of shape to it, and doesnt just have the horizontal over the tummy.
If I had to pic a frontrunner....maybe #1 slightly over #3 because the top part colored differently is a little distracting but I think it might look even nicer in person so and that bottom detail is stunning....maybe
Oh i just read the other comments, I like to post unbiased first and then read them.
Dress 4 is my dress. Oh and I see someone posted that already too. LOL
One thing i liked about it is because it has a longer torso, I really felt it made me feel taller and slimmer (then again i am 5 feet tall, so feeling taller doesnt take much). SO I can see what you mean about the sholders.