I know it might be an unpopular option on here, but what about a 2nd hand macbook air 11"?
It pushes many of the right buttons for you, it's light, small and plenty powerful. You can even install windows on it if you fancied.
I've had mac laptops for a good few years now, not that they are perfect, I'm under no delusions, but I've personally never had anything go wrong with them. Most of my old ones were passed down to family members and they are still going strong, my mum still uses the powerbook g4 i gave her!