Tough call between my monitor at work (21" Cornerstone P1600) and my home computer. I'm going to go with the home computer, since that was purchased with my own money.
It was purchased 2 years ago (Sept 2002) for $600: Dell Dimension 4500, 2.4 GHz P4 (533 MHz), 384 MB RAM, GeForce 4 MX, 40 GB HD, Win XP Pro, 17" CRT, and all the accessories.
Today you can buy almost the same thing from Dell. Dell Dimension 2400: 2.4 GHz Celeron (400 MHz), 512 MB RAM, integrated video, 40 GB HD, Win XP Home, 17" CRT, and all the accessories. $484.
Looking at the two, my computer is better and the price 2 years ago was just over $100 more. That's a lot of mileage for $100. I always intended to upgrade the memory and the video card when prices came down. But it plays my games with enough detail to be fine with me. Sure I have to turn some eye candy off, but that isn't a big deal.