My system includes three (3) 32 inch monitors to monitor and control my station and for logging. Two monitors connect directly to the graphics card in the computer; the other connect via USB to video converter.
I bought a new computer earlier this year - a tiny little Acer Veriton. It is the little computer that can. Intel Core7 processor, quad core. It has 8 GB of RAM and a 256 GB solid state drive. This little guy has both USB and USB 3 ports, two video ports, and even a real serial port. That's a lot of modern computing power in a small box. Here's a graphic of the computer with a thumb drive and speaker plug (in green) to give a better sense of its size. Click on the graphic for a larger graphic.
I use the DX Labs software suite for general operations and DXing and N1MM Logger plus for contesting.
Double click on any image to enlarge it.
Some of the ancillary control equipment uses USB connectivity so I fill up all the USB ports on the computer and have a couple of external USB ports for the rest. Some of the control equipment connects via serial cables driven by USB ports on the Flex 6600.
The three monitors appear to be one very large graphic in this screen shot. It actually is three screen shots encompassing the one monitor. The left hand and center parts show the DX Lab software as I use it. The right hand third shows the rotator and amplifier controls. Click on the image to enlarge it.
I use N1MM Logger+ for contesting. The following three graphics show my N1MM setup from the recent CQ WPX RTTY contest. Click on the image to enlarge it.