I use my portable at home, I don't travel much. I am looking for a good machine to use in various locations around the house including the couch. I have a desktop put don't use it. I spend most of my day at a desk so prefer not to be at a desk at home. I am not a gamer or power user. Should I get a 15 or 17 inch portable as my main computer? I have had 15 inch in the past and been happy however I am thinking about upgrading.