I'm looking for a really specific kind of product and I'm not really sure if it exists. I'm looking for an external soundcard (USB or Firewire, it doesn't matter, it's for a laptop); that has stereo output (the objective is to listen to music via Sennheiser headphones) but that also has recording capabilities (more or less like the M-Audio M-Track) mainly for guitar, voice and bass.
I don't really know a lot about these things, I guess that is evident in my question.
Am I looking for something that doesn't exist? Do you know any other alternatives?