While .com usually means commercial, it has evolved into a standard extension for websites. I'm in Canada and most Canadian businesses have the .ca extension, even though they are commercial. Same applies to the UK and many sites with .co.uk.

Also, .org is suppose to be for Organizations, both profit and non-profit, yet many sites have that registered as their domain extension and have nothing to do with any Organizations.

So it basically falls into the question of how much do you want to pay for your web extension? .com, .net, .org are usually 8$ and under, while new and foreign or new extensions are more expensive, ranging from 40$+ for items like .tv and .mobi