I've learned that I work better with less stuff around me, so I got rid of a lot of toys, pictures, printouts, spare parts, little-used computers, etc.
If you're going to set up an office but keep it minimalist, what items do you still bring along? Assume you have the budget you want.
For example, you could just work on a laptop, letting one item work as PC, monitor, keyboard, mouse, and speakers, with only a couple cables.
You probably want a good chair and a desk.