well the one piece of advice i can give you is to never, ever buy boot online because all boots are made/sized differently and they need to fit your feet perfectly. if the sports authority boots fit you perfect, go for it, if not go somewhere else and try on boots to get a perfect fit. boots are one thig you shouldnt skimp on.
as far as the other stuff, without the models or anything i cant really tell you if its good or not. i also have no idea if the sports authority stuff is any worse... sry