Dress #1 is from Amazon. Until recently I didn't even know that they sold wedding dresses, but I think this would be a lovely beach wedding dress.
Dress # 2 is a tea length which might be nice on a beach.
This is an Oleg Cassini sold at David's Bridal. http://www.davidsbridal.com/Product_oleg-cassini-tulle-short-wedding-dress-with-lace-cwg662_beach-destination-wedding-dresses It's on sale for only $599.99.
Dress# 3 looks like it would be good for a beach as well, and the price is very affordable at only $103.95. This may be a sale price. The dress is sold by Eric Dress.com. You can see all the details at:
Which one is your favorite? I think I'd pick the first one because of the beading, but that #3 is really nice too.