Well, I wouldn't throw away the Sport band. I would keep it, if for no other reason, for resale value.
What I really meant to ask is, if I want to buy an aftermarket band, will I likely be able to get the slider hardware to accommodate it. Personally, I really don't like the sport bands but am fine with the sport watch, so I want to buy a sport watch and put a aftermarket band on it. Hopefully, right away.