How to create a Home Workstation

Hi all,

I am looking for information on how to build a home "workstation."
What I would like to have is a single box (dual cpu's?) that has two of everything outside the box (monitor, keyboard, etc.) I know there are video cards that support dual monitors (any suggestions?).
I would need to be able to login independantly on the two monitors (XP will be the O/S), i.e. be able to play a game on one monitor and create a word document while on the other.
Any pointers on how to configure this and suggestions on hardware??

Thanks,
Gary

heres some additional reasons for wanting this type of setup:

actually...I need the dual keyboard/mouse/monitor ect. because this is a setup for my two kids.

i want to have a single "workstation" table where they can both work at the same time...accessing the single computer.
i just wanted to avoid buying two separate computers hoping to save $ and deffinately saving space. i also wanted to try a new hardware setup.

can this be done?