For those of you who use dual monitors, in your opinion does it make a big difference if one monitor is the same size/resolution as the other? I've got a 22-inch Viewsonic right now, and want to get a second screen to go with it. I'm debating to go with a 24-incher or get something smaller that' s in the same resolution as my current screen. This isn't really a technical question, I'm just curious about people's experiences and opinions about what's the most practical.