Confused as to what chair to use for computer use

Hi, I was wondering which chair should I use when I am working in the computer at home. Is it better to sit in a fabric folding chair like the one somebody posted in a different topic here, or should I use an office chair? (Also because that article Maya posted about "your office chair is killing you" I read it also when yahoo posted it, and since then it has made me wonder about office chairs. This was before I located Esther's wonderful method thou)

I ordered the stacksit cushion which should be here any day now, and want to be able to use it with the proper chair.

Thanks