What a coincidence (although I suppose almost every day the $100 question gets asked)! I'm also in the market for some full-sized cans. At first I chose the AD700, but then I read that they're bass anemic. I'm currently using a pair of Panasonic Slimz and they have 0 bass. I can't stand it. I dropped the idea of any open-air headphones (the HD555 specifically). I've concluded that anything in the $100 range that is open-air can't possibly have good bass.
Then some very popular closed headphones came into my view. The MDR-V6 (allegedly the same as the 7506), HD280, and the SRH440. I haven't really seen anything else in this price range as enticing as those 3. I'm worried about comfort mainly. I intend to run all of these through my Razer Orca's (RIP) extension cord, chill on my sofa, and playback some games/anime (speakers are not an option....).
Are the pads on the V6 uncomfortable? I see people paying $20 for the beyer velour replacements.... Thats 1/3rd of the headphones price (1/4th of the 7506). Is the stock one uncomfortable or does it just break apart?
I hear the SRH440 are total crap when it comes to comfort. They get hot and the headband is hefty.
I don't know that much about the HD280, but I've seen it stated that they're better for all-round when compared to the V6.
It's down to those three and I'm really leaning towards the Sony pair. If anyone can tell me otherwise about the bass on an open-aired pair then that would also be welcome.
EDIT: Forgot to mention. These shall be my main headphones. I mainly listen to orchestra (video game soundtracks, movie scores, some classical), opera, and j-pop.