I would not sell a 2011 M3 to get into the 1M. Maybe if you had a 2008 and were looking for something a little different. I love the 1M coupe, but there's definitely not enough incentives to trade in a brand new M3 for one. Don't get sucked into all the "New M Car" hype. It's definitely well-deserved, but in no way does it make it a better car than the M3.
E92 M3 sold. S2000 acquired. Cayman GT4 allocation obtained.