The short dress - doable for the wedding or bumping it to reception only?

The vision of a floor length dress and a flowing train is one I always imagined as the "traditional dress". I still will be wearing this type of dress. Somehow my apparel turns uber-conservative when I enter a church. I bring out the school teacher friendly length skirts and my cutest heels are kept in their boxes.

I love short dresses though. One thing I've got is long legs (for my body, no I am not otherwise shaped like a model). I'll change into a shorter dress for part of my reception. Salsa requires short dresses!

Designers are now creating more options for the cocktail length/dance-friendly dress.
Amsale even has a Little White Dress Shop.

Net-a-Porter and Nordstrom also have wedding sections with quite a few short dresses. Nordstrom has an awesome selection of longer dresses (all under $500! if I didn't love lace so much, I would have gotten a dress here).

Here are some of my favorite options:
Theory Edwina cotton dress - $345
Notte by Marchesa - embroidered cocktail dress- $795BCBG Strapless Applique dress - $398
BCBG Laser cut sheath dress - $268
ABS by Allen Schwartz Puff sleeve one-shoulder dress - $240The cool thing about shorter dresses is that they're usually cheaper and they are perfect for all the grooving we will all end up doing at the reception.

So what do you think about these short dresses? Doable the whole day or just something you'd switch into for the reception? Or whatever, I lovveeeee my dress I'm not taking it off!