So, I am going to say what Brooklyn said -- don't settle too early. The black dress is a bit too casual/ fitted for what you have in mind, I'd say, and the B&W, while nice, looks a bit large, and if it is poly, that won't be good in the heat unless you'll only be in AC.
I like the tiered skirt on it for you and like the B&W pattern, but like others, I've had less than happy experiences with that type of sleeve -- for me (just for me, mind you -- not necessarily for you) it feels too girlish somehow, and too fluttery. I did what someone else suggested and had a dress with those sleeves made into a sleeveless and I loved it.