For whatever the worth, a nice brand new 32" HDTV can be purchased for $199, with several brands to choose from.
I am aging rapidly, and sometimes my eyes hang lower than my ex-wife's eh external gear. I find the larger screen size to be quite helpful.
I later ended up purchasing a gigantic 46" HDTV and now use both displays.
It's really about how good your eyes are, how much you have available to spend, and how much room you have for putting a display somewhere.
I WILL say that bang for the buck, you can get a much bigger HDTV for way less than an equivalent actual computer monitor. I find them to be quite adequate for display quality when using Sonar.
I was just today contemplating turning the 46" display on its side, and changing the layout to portrait, to see more vertical display - more tracks vertically and all. The 32" display is used for displaying mainly the console, and I can drag other things over there if needed.
Hope that helps you,
Bob Bone