So the cable on my Portapros gave out after a few months, so I looked into Koss' lifetime warranty, and it states that I must send them a check for $9 along with the defective product. Can I just send them the $9 in cash? I don't really have a bank account, so I can't write a check.  

Thanks! I'll see how much money I can rack up. Hopefully, I'll have enough for the D100 MkII

You know what? I'll take my chances and go with the Denons. I'm sure I won't regret it.  Now, what is the best DAC/amp I can get under $500 for the Denons? Should I go with the Yulong D100? 

I don't listen to many bass intensive music, actually. I'm getting the headphones as a graduation present, and I was planning on using some of the money I got from relatives to purchase a DAC/Amp

After reading a bunch of reviews for the Denons, I have developed a few doubts on whether they're best for me, as many claim they do not clamp well to your head and have unbalanced sound.  I have read a lot of good reviews for the Sennheiser HD 650 however, which people claim to be top tier...

Just looked into the the D100, and it does look like what I'm looking for! Thanks for the recommendation. I will go with the D5000 and the D100 for now, unless I find something more suitable for me, or change my mind. I am not buying anything for another month, so who knows what I might find. ...

What's your opinion of the Denon AH-D5000? I read it has good bass that doesn't drown out the other aspects of the sound, and is top tier for it's price range ($400-500). I could get those and then save up for a good amp at around the same price rance (any recommendations?) Thanks for your input!

  I come to you with a budget management question.  Right now, my current setup is just a JVC HARX900 with a PA2V2 amp and my PC's onboard audio, listening to music encoded in FLAC.  To "upgrade" my listening experience, I was wondering whether I should buy a USB DAC, or get better...