Unlike desktop systems, notebook computers aren't designed to upgrade.
Comparison shopping is a little more difficult.
You can get the screen or the keyboard at the right height to reduce strain, but not both. However, if none of the above is likely to sway you, or if part of your office work is mobile, you have a wide range of choices. I'm not going to address the Apple versus PC debate here. If you're convinced that you prefer one platform over the other, nothing I say will make any difference. Secondly, and perhaps more importantly, local assemblers can't compete with the big guys when it comes to the type of proprietary engineering that goes into notebook systems.