I use 2x 1920x1080 23" and I wouldn't think of ever working on one (or even two) 5:4 monitors. You need the screen space... It's not just TestComplete, it's VMWare, all your management tools, calculator, Notepad++, web browser, etc... They will all be opened 100% of the time the person will be working on it. I could even use a third of those 23".
We use VMs for all the test machines here, and we test the application in 1024x768. TestExecute doesn't care what resolution you use. TestComplete runs full screen in 1920x1080.
