If all you really need is an internet PC any integrated chipset should do.
With your intended use I would look at AMD, SiS or VIA chipsets first merely because of power consumption and heat. SiS and VIA tend to be used strictly on cheaper boards with less features, and have more outdated video capabilities. AMD and Nvidia seem to be comparable on features and video capabilities.
Personnaly I would put the features, quality and/or price of the board first, not what chipset it uses, although I personnaly would lean more twards either AMD or SiS for your needs.