For that much money, I think the M3 is a better buy.
That being said, I am going to take a hard look at a low milage B8 S4 when my M3 lease is up!
(Waitlist): #1 M2CS
(Current): 2016 F15 X5 3.5xdrive - 2016 F30 340xi M-Sport
(Past): 2013 535i xdrive - 2008 E92 M3
2006 E90 325i - 2002 E46 325xi
1991 E30 325i