I'm a fan of HP's higher end laptops. They build powerful machines that can be true desktop replacements.
For value, Lenovo's are great if you're looking for something just for basic office applications, Internet, and watching the occasional flick. This is probably more inline with what you're looking for. You could probably pick up their last gen Yoga2 for very little, and it's a really nice package.
Apple and Sony will charge a premium just because they can.