I was going to get an RS4 (1 1/2 years ago) until I saw the price. I pot'd for an '06 S4 instead, which has been great.
I wanted the B7 S4 over the E46 M3 since the E46 style is looking a little dated (still gorgeous though) and when the lease is up on the S4 it'll be about a year into the E90 M3 life span so I can get one with the first run kinks already worked out.
IMO the RS4 is over pirced by about $5-8K.
2009 E90 M3 | Silverstone II | Black Novillo | HRE P40's | Akrapovic Exhaust | Eibach Pro Kit | Jet Black Kidney Grilles | SSII Side Reflectors | SSII Side Gills | LUX H8 Angel Eyes | Macht Schnell Filter | Tecnocraft Envy Charge Pipe
"M3 drivers have no friends." - Jeremy Clarkson