Oh, how I love Zappos. I (finally) ordered a Camelbak yesterday, and it's out for delivery now!
This is the "women's" size, so hopefully it will work out for me because I hate, hate, hate carrying bottles on long runs. I'm concerned about chafing, so Body Glide will be my friend as well. I did a lot of research, and this one seemed to be the winner. For ultras and the like, bigger ones are recommended, but this one's 50-ounce reservoir should be just fine.
It'll be quite comical watching me put it on for the first time. I'm sure I'll require some help from Aaron.