DavidZheZhe usually suggests that if all you are using is low impedance and high sensitivity headphones (<64 ohm, >100db), the best candidate for driving these type of cans is the less expensive hybrid Little Dot I+. If you ever want to dabble into high impedance and/or less efficient (low sensitivity) headphones (which many excellent headphones are), the Little Dot MKIII is the best value of the bunch. The MK III also comes with a pre-amp section so you could also use some M3's in a stereo setup with this.

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne