If you've got a big box store around check out the lenovo yoga 2. Hidpi screen, ok keyboard, good battery and relativity cheap. The convertible screen comes in handy as well. I thought it would be a gimmick but I ended up using it pretty often.
A down side for me with newer, lightweight devices is that often there is no practical way to open them up to change anything.
I have a Thinkpad W500 (WUXGA, yay!) that has hinge issues, so I'm looking for a replacement. The W500 (and I assume other versions of the larger Thinkpads) makes it easy to slide in and out different hard drives, and upgrading memory is easy.
I'd like that in a new machine but it seems to be a feature of workhorse machines that fall short on battery life (as does the W500).