I love that you can buy a bunch of parts and cobble something together which has a ridiculous amount of processing power. I love that you can buy a GPU which can render a mind numbing amount of quadrilaterals on the screen simultaneously. I love that there is a plethora of tools which you can quickly write programs which can do interesting and useful things.
I actually think we take PCs too much for granted. They're absolutely amazing devices.
EDIT: spelling
There's a specific kind of OS I'd like to have. But I'm erasing my description about it from this comment, because announcing your goals makes it less likely you'll achieve them[1].
In the end I want less software complexity. Having less hardware can lead to having less software.