Currently I have a pair of pxc 250 headphones but I'm looking to get some over ear headphones. I just need some assistance. Maybe even some pros and cons. The two models I'm looking at are the HD 595's and the PXC 350's. From what I understand the 595's dont have noise canceling and thus should give some of that sound like if you put a seashell to your ear? Because my 250's do that when noise canceling is off. And how does the sound quality of the 595's compare to that of the 350's and the 250's? Thanks for the help!