I'm planning to purchase some for my audio device sometime soon. However, the subject of becoming deaf haunts me about "in ear" buds that cancel outside noise. I'm considering the following: Panasonic RP-HJE50 Sony MDR-EX81 I've only done research on these two earbuds so far, both of them have received positive reviews. However, there's one problem. I'm on a strict budget of 40 dollars, and I can't differentiate the performance between spec sheets. Being that this is a "Digital Audio" forum, i thought it'd be useful to get some help from the pros who use noise-cancelling headphones for a living. Any suggestions other than these two earbuds?