Personally I like Ravenclaw first,then I'd go with Slytherin and tied in 3rd Gryffindore and HufflePuff.And I think Luna has qualities that place her wherever she want's.She is in Ravenclaw,beacuase she is not as dumb as some say she is.She has proven more than once she is quite brave,worthy of Gryffindore.And she has shown above all else that she is very,very loyal and kind hearted(a true HufflePuff).