If you leave them at home, the day is immediately and markedly more intolerable. If you don't have a good set at work, the day to day minutia becomes harder.
I'm talking about headphones, an essential tool for anyone who commutes, works in an office or games.
Headphones have always been the one thing I've been happy to spend a bit of money on. And I haven't traditionally gone with gaming headphones or gaming headsets. I like the higher end equipment -- the Audio Technica's, Beyerdynamic's, AKGs, things that are a Little Bit Fancier.
I still long for the day that Phillips remakes their giant cans with the big blue earpads. The HP890's aren't sold any more, although I'd probably fork out the money for them if a pair popped online on Amazon or something. Loved them that much.
Right now my work headphones are the closed Audio Technica ATH-A550Z headphones. They're not too bad -- not the nicest build quality, and being closed means the audio will suffer a little. But it does the job and I didn't have to fork out more than $200, so I'm fairly happy with the purchase.
What headphones do you use on a day to day basis, and how much did you spend?