HTC EVO 4G :: Looking For A GOOD Quality Mp3 Player

I don't expect a cell-phone to outperform dedicated devices (camera, camcorder, etc.), but I figured that my mp3 player was one thing that this phone might be able to replace.Thus far, that hasn't been the case. Pandora and Slacker are "okay" with sound quality, but I understand the limitations, so that doesn't bother me.What does bother me is the underwhelming sound quality when playing mp3's via the aux input on my car or through headphones. My first generation Zune has far better audio quality and I can't bring myself to put it away just yet. All of my mp3 files are at a minimum of 192kbps, with most of them being 256kbps or higher. Are there any audio players that offer better sound quality and at least SOME level of adjustment of the equalizer? Presets (Rock, Acoustic, Jazz, etc.) are just fine as I'm not trying to tweek until I'm blue in the face. If nothing just yet, I expect an update to offer some sort of remedy. The last firmware update for the Zune did a great job improving what was already very good sound quality.