Was probably going to get a set of 6.1 computer speakers, but it occurred to me, is it better to have a 5.1 soundcard with the speakers upmixing to 6.1, or to have a 7.1 soundcard? Is it easy to plug in a 7.1 sound card to 6.1 speakers?

Cheap 6.1 sound cards seem to be quite rare so I'm basically limited to 5.1 or 7.1 as far as I can see...