This can get as expensive as you want (probably more so), but to make full use of the expertise of the people here you are talking about an absolute minimum of around $1K total for speakers, amplification and one source. You'll get a lot more help and input starting at around $1K per component.
Another thing to consider is that these systems are intended to have the right size and shape room arranged around them as much as possible. Preferably a rectangle with the shortest dimension no less than 12 feet, and the speakers idealy end up sitting way out into it.
Another thing to consider is that these systems are intended to have the right size and shape room arranged around them as much as possible. Preferably a rectangle with the shortest dimension no less than 12 feet, and the speakers idealy end up sitting way out into it.