Guys - i bought my WIFE the M5; She is the daily driver - although i haven't seen her RPM's above 1800 yet
Seriously - we switched her 2011 740i for a 2012 F10 M5 - she loves it - and i love it too as i get to drive it, in addition to my 911.... i'd say, give HER the M5 and buy yourself an additional toy...