You don't need a spare headset to use with Skype. Your own normal stereo headplugs don't take up any space, and will work just fine. Most laptops have a built-in microphone, so the headplugs are all you need.
I use Skype all the time and the voice quality is better than many normal land and mobile lines, assuming that the internet connection where you are is half-decent.
...all right. Back to lurking