I for one think the avant looks very nice.
And all this talk about the S models being unecessary is rediculous, both BMW and MB have 4 or 5 variants of the same car (525i, 525xi, 530i, 530xi, 550i and then of course the M5) so why cant Audi have an A6 3.2, A6 4.2, S6, and then RS 6. IMO The S6 is a just another step up in the line because not evrybody is going to be able to purchase an RS 6, so they can get an S6 which may not bet as good performance wise as an RS 6 it is still better than a 4.2.