The S5 is shooting a gap between the M3 and M5 which may have looked good on paper, but I don't think it works out in practice. Maybe if you're an M5 guy and want a coupe. Audi doesn't seem to desire to take on the M3 directly, of course magazines will do that for them. They line up the S4 against the 335i, and I'm guessing the RS5 is more aligned with a Merc, not sure. The RS5 sort of its by itself out there in its price range. If I was Audi, and with BMW dropping the Sedan M3 for the F30, I'd bring back the RS4 and gobble up some of that market share before IS-F and C63 get all of the sales.
08 GT500 convertible red package (Black w/ Red stripes) /Ford Racing Exhaust /Cold Air Induction 560hp
10 Porsche Cayenne GTS Black w/ Black Wheels 408hp
11 M3 Silverstone w/ Silver Novillo Leather /Tech /Premium /19" /DCT /Ipod 414hp