Is there any good reason for me to have video card on my PC if I don't play games?

If you're not going to do anything that really requires a graphics card, no you don't need one. But, if you get a large HD screen (say 22" or bigger), I would get one, such as the 8400GT or equivalent, because they have a digital video socket than the old og sockets, and thus supply you with a better picture.