The M5 has the seriously understated, executive I'll-fuck-your-day-up look down pat. I've always admired it for that, and for the driving dynamics.
It did feel extremely heavy at the 2 Day M School though...
If I was late 20's+ I would more strongly consider the M5. I like the M3 for its mod community too.
Past:'08 E92 335i|ZPP|ZSP|6AT|four (4) HPFPs
Present:'15 Mustang GT|401A|PP|6MT|Recaros
Sig pic unrelated. I like to go sideways and stuff.