The look you are going for is very "Hollywood Glam" which is great, because it is a fashion forward and classy look. The 4 strand rhinestone choker will look great, especially since the dress is strapless. Since you are going heavy up top, then if you do wear a bracelet I would suggest something simple. Maybe a 1 or 2 strand rhinestone bracelet, verses a multi-strand. My other suggestion is, if you are wearing earrings, make sure they are small and simple. You don't want the earrings to compete with the choker, which will look stunning by the way. Since your dress doesn't have any rhinestones or bead work, it is great that you are adding it with your accessories.
As for the people standing up with you, they can wear whatever kind of shoes you want them to wear.