The main computer is an AMD 450 overclocked to 500 MHz, with 128Meg memory and a 15 & 5 Gig HD. I built this one from scratch. The monitor is a Digital 20" fixed frequency type that my son picked up for me off EBay. I have an HP500C printer - thats the workhorse and an Epson Photo750 - thats for the stuff the has to look real good. It produces prints virtually as good as photographs. The ink is expensive though, therefore the HP remains. I also have a UMAX 2000U scanner.
We connect to the internet via a DSL line at 340K.
I also have a 233MMX machine for auxiliary use, robot programming (it has 3 serial ports). It's connected by Ethernet to the main machine and can access the internet via Wingate software. I often get both machines involved during programming and monitoring microcontroller projects.
I also own an HP 1701A Oscilloscope -an essential machine, another EBay purchase. I'm glad I opted for a separate analog scope - it's just real handy. I now have a Power supply / Frequency generator that I constructed. I also own an HP logic analyzer - another EBay purchase - that I still haven't used.
Other than that I have a growing assortment of electronic parts, books, small tools, etc.