I'm getting a pair of Audio-Technica ATHM50S headphones, my current pair (Some $30 Koss model I got from walmart) are too quiet. Even with the computer volume maxed out and the pandora/CD/youtube/etc maxed too....it's not loud enough for me. So I'm guessing the ATHM50's will be too quiet as well. So I'll probably want an amplifier, right? I see there are portable amplifiers, and desktop...anyone want to fill me in? Thanks!