I have a cheap monitor option for you. Its called a KVM. It lets you use your Keyboard, Video, and Mouse between two or more computers. Here's an example:
http://shop4.outpost.com/product/3666945
They are cheap, you can find ones cheaper than that one above. I use one with my linux machine and old dos machine, and for a time I used it between my dos and windows xp machines. I'd recommend one over another monitor.