Looking to get some over-ear and these are all in my budget. Which of these three is the best for sound quality + comfort? I've heard the M30's are far more comfortable, the 668b have the best sound? But the 681 are the cheapest and I've read mixed reviews about 681 being better than 668b.
What is your general opinion on which one of these I should purchase? I listen to all genres of music and will mostly be using them at home. Keep in mind that I will NOT be MODDING these in anyway so I need to know which sound the best straight out of the box (or after burn in)? Thanks in advance!