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I dont know why but the sony V6 looks a bit cheap for me...
I know what you mean, but trust me, they are very durable. I've put my 7506 through hell. Short of the known enemies of headphones, like axes and fire, they'll stand up to a lot.
In general I think that if you're taking sound engineering courses, most if not all of the cans mentioned are good enough. The M40 is easily not in the same league as the rest, but I do think it may still satisfy you unless you let the head-fier in you get picky.
Data and anecdote say the 7506 are peaky, but I used to use them day and night without feeling the particular fatigue of treble peaks, so that's where I'm coming from in suggesting that you can just grab whatever and go.
These are all studio cans, and there will always be people who say they use them to great effect. And they're not wrong.
Every headphone mentioned in this thread has a characteristic sound. A couple, like the Sony and the Beyer, have been described as bassy. I believe the M50 has been described as both bassy and bass light. If you're anything like me, you're gonna go nuts picking one. What they sound like when you first listen to them is probably not as important as how well you get to know them and make them your ears (unless they're terrible on you).
I know little about hammers except that they're useful for driving nails and stuff. And I know how to use one to great effect. But to pick one out of the many that are different in a few ways, when fans of one model or another will try to lend their subjectivity, is an exercise in vanity. Even people who don't have an agenda per se will tell you, "This hammer B is great for very long nails, but for short nails that you can sink in two strokes you'll want an angle more like hammer C." You can just pick up a hammer. If it's not a bad one, you will get your work done.
I'm gonna be the guy who recommends something cheap. I already know I like the V6, and while I haven't heard the M40fs, I've always wanted to give it a spin. I'm one of those people who says that if you're still learning how to do something, cheap tools are part of the experience. Not a masochistic type of experience IMO but more of a fundamentals-first thing. My mom hates that I do this. But she grew up having people just give her stuff. I didn't.
For my collection I would like to have one of SRH940, K271, or KNS-8400 to put into heavy use because I've heard such great things about them that make me want to really give them a workout. And I've not read a bad thing about the GMP, so obviously I'm quite intrigued. But that's the same vanity that I believe sometimes gets in the way of audio work.
You mentioned comfort. I'd really like to hear owners of these cans compare them from a wearability standpoint. The Beyer looks like a winner. As does the 940, though some people got scared when the press pics showed bumps on the headband. The 8400 with memory foam pads sounds lovely, but may be like a rubber jumpsuit inside after half a day. Like I said, hopefully someone can offer some experience with long-session use.
What's your current coursework? Studio? Live music? EFP?
. A lot of the Sinatra albums that I've heard are far from bright. IMO, the dt48 and the 240DF win the battle for most 'true to life'. But, I think the disagreements on head-fi often boil down to subjective preference. When we battle over which headphone is too bright or dark it's almost like arguing whether chocolate is better than vanilla. A guy I met online who mastered a lot of successful albums swears by the hd650. I thought they were supposed to be too dark and veiled 
