A key that is often overlooked is your room & proper room matching. You want to consider the room your system will be placed in. Will it be there for a few months, or many years? Then you want to consider a speaker that isn't too much for the room or it will overload the room. Also, on the other side you don't want one that is too small and needs to be almost "over driven" and sound strained... keep the room size and proper matching in mind. Go from there, including the good advice above.
