Gowning Around

I have two important weddings coming up in 2013, my brother's in this summer and my cousin's next winter.  Since I'm in the bridal party for my brother's wedding, my dress situation has already been decided upon for me (shimmering, strapless, purple).  But my cousin's wedding is going to be a Saturday night, super fancy affair in New York City.  I know I've got lots of time until next winter, but my mom and I were just talking on the phone about it last night, plus the winter sales are going strong and so I've just been browsing a bit.  What do you think of these???

Clockwise from top left: Halston Heritage beaded crepe halter | ML Monique Lhuilier satin trim gown | ABS belted gown | Rebecca Taylor strapless gown.  I'm personally digging the backless Halston halter dress.  We'll see....