Well, I went home and had a look behind my computer, and there is indeed a voltage switch (hidden underneath a sticjer), so my computer will be going with me to America. As for the monitor, It's pretty big so even if it will work abroad, by the time I've shipped that S.O.B I may as well just put the money towards a new one - good excuse to get a flat screen.
Thanks for all the help guys. I may have some more compatibility questions in the near future.