I have a 15 Sport on the way myself, after at various times coming close to buying ARs from DPMS, Palmetto State and Del-Ton. I'd given up on the Sport because nobody local had them in stock and most claimed that their distributors didn't have any either, so I jumped at the chance to get one for a very fair price. I'll have it inside of a week.
As a newcomer to the AR world myself, I was practically overwhelmed with all the choices, but the consensus seems to be that the 15 Sport is at the very least a great starting point. While there are other ARs with more features for the same money, I think there's a lot to be said for S&W's reputation for customer service and consistent build quality.