My girlfriend got a sweet Lenovo on sale for $350 and she uses it for basically the exact same things as the OP and it's probably more powerful than she really needs. $300-400 is perfectly fine for the OP's intended use.
Exactly my point, people that assume a computer is usless if it can't play games at max graphics at 1080p don't seem to consider not everyone needs that but just a basic machine. For what the OP said he needs it for, his price range will be fine.