I currently use a 17.4 in high res screen. However, when I multitable I cascade them and play a pretty tight standard format until after the bubble bursts. Once I'm in the money, I drag the screen into one of the 3 corners that isn't my cascade corner and open up my play. I also use a HUD (since I play on Carbon now they offer a HUD for free) to give me a bead on a player's style once I've reached the money. This allows for optimal outcomes because once I've cashed I'm playing to win, analyzing the play of my opponents at my table, taking notes, and all while still being able to multitable the other tourneys I've joined in my cascade. So anyone who tells
you that you have to have a huge display or multiple monitors to multitable obviously hasn't figured out how to do it otherwise. I feel it all depends on your personal preference though. If you have the talent and vision to watch every player at every table, take notes at every table and take advantage of situations while multitabling, then maybe a big display is for you. I prefer my method personally, but if something like this doesn't work for you then try something new. Success in poker is about your personal comfort, so do whatever makes you comfortable.