I recently switched from 2 17" CRTs to a single 30" LCD and, like you, am in Visual Studio most of the day. Go for it. Being able to see more lines of code and even to run VS as a windowed app side-by-side with the one you're debugging makes a HUGE difference. If you go as big as a 30" though, you'll probably change your habit of having the windows full screen, I definitely did.