Computers in the Shop

I am putting together a CNC outfit for my shop.

I have a variety of computers available to me (laptops,
horizontal/vertical desktops, rack mounts) to choose from for the
controller. Same goes for the furniture that the computer will be in
or on.

I would like to hear from others as to what your computer
configuration is and how well it works for you.

Some of the issues that I am looking at...

How important is it to have the computer ruggedized for the less than
favorable conditions that a shop environment presents?

What type of rack, desk, table, etc. do you use to hold your
equipment?

How portable? Built into a stationary rack/desk or should it be
portable to move around to different machines?

Do you use it standing or sitting?

How big a display? Monochrome or color? CRT or LCD?

What type of keyboard? Mouse or trackball?

Thanks in advance,

TMT