Selecting a lower-res display?

My setup consists of a Windows 7 PC with two monitors:

- 26" 720p (1366X768) primary display - Toshiba 26AV502U LCD Television - 20" 1024X768 secondary display (Generic Dell monitor)

I prefer lower resolution, as this allows me to sit further from my screens, and is easier on the eyes. I have tried, for example, to run Thunderbird on a 1900X1200 display, and everything is just too damn small.

I'd like to add a third display that is energy-efficient (Energy Star) and gives me 720p, or close, at 26" display size - native resolution, but the trend is in the other direction - higher and higher resolution.

I know I can try running something at half the native resolution, but that requires I get a display which runs something ridiculous like 2600X1600.

I suppose I can get another of the Toshibas, but I'd prefer something more energy-efficient.

Ideas?