What to Wear?

I'm going to a wedding in Houston, Texas in May. It's a 6:00 p.m. wedding and I think I'm going to use Rent the Runway for a dress. I'm tired of the options in my closet and these are so much more fun. Which of these would you choose for me to wear?

1. Vera Wang 2. Monique Lhullier 3. Preen

1. Alberta Ferretti 2. Shoshanna 3. Carmen Marc Valvo

1. Issa 2. Trina Turk 3. Lilly Pulitzer 

I'm leaning the Preen or the Carmen Marc Valvo, but am open to suggestions!