Here's my setup from last night when I finally settled on a good arrangement, although the tinkering of course will never cease.
My monitor is 2560x1440.
I run P99 in a window with the following in my eqclient.ini:
WindowedWidth=2000
WindowedHeight=1382
I leave 560px on the left for desktop stuff. I leave 58px on the bottom because I like to see the taskbar.
Once game loads I did /viewport 0 0 1440 1080
Now I have perfect 4:3 unobstructed view because I can place all the UI elements out of the viewport. Also, it's centered on the monitor because of the 560px padding on the desktop to the left and another 560px padding inside the game client on the right.
I changed the Window-->Background-->Tint Color for all the windows to 0 0 20 so there's some contrast.
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This is so not classic. Har har har.