Looking for a portable laptop for college next year. Preferably screen size 14' and under. Want pretty thin and at least 3 hours long battery life. weigh less than 4lbs.Need at least 4GB RAM and a 300 GB HArd Drive. Prefer windows 7 but wouldn't be to opposed to windows 8. Budget is about $600. Looking at the following: Acer aspire s3, Asus vivobook 11.6, toshiba satellite U945, dell Inspiron 13z/14z, Sony vaio t series (have read how loud they are), and I was set on the Lenovo ideapad U310 until I read about the infamous wifi problems and I don't want to deal with that. Any suggestions are appreciated.