Do you want it to be an all-in-one set, or would you consider putting it together from different components?
Requirements on size etc.?
There are some pretty good systems starting in the $400 range, but if you have the budget for it, you can get significantly better stuff, especially in the speakers department if you put a set together yourself.
Did you mention 1000watts since you want something really loud? What sized room is this going into?
Is this mainly music or movies/gaming?