I wouldn't pay over $59-$60k for a 2011 used. As everyone said you can get a new 2013 for around $67,500 - $68,000 (very well equipped, it's about $70k loaded with every option).
Plus, since 2013's are hitting the shores now, 2011's are technically 2 model years behind. The prices on used 2012's are still the same as NEW 2013's.. I don't get it.
I still think $60k for a 2 model year old car is kind of high, but finding a 2011 M3 lower than that is nearly impossible. Best deal i've seen is a 2011 e92 w/ 8k miles fully loaded (literally everything), space grey on black, for $57,500. If I didn't hate black interiors so much and think gray on black is literally the most boring combo (no offense anyone) I would have bought it in a heart beat