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Either the biggest, highest resolution flat CRT you can get your hands on. This will probably mean a good 21/22" CRT, most should be capable of 1600x1200 at very nice refresh rates or 1792x1344 at something livable (70+ hz typically, the higher the better).

For fixed pixel displays (mainly LCD for the computer world, but also applies to plasma & DLP based devices) you'll want again want the largest & highest resolution you can afford.

The problem with the majority of the 19" LCD panels is not their size, obviously they're only an inch smaller than a 20" model. Most 19" LCD's are only 1280x1024 pixels, which offers significantly less desktop space than a 1600x1200 native resolution display. While CRT's can handle any resolution within their bandwidth limits, LCD's do not handle non native resolutions well and cannot be run higher than their fixed pixel resolution. You can run them at lower resolution, but it won't look anywhere near as good as it does at its native resolution.

In short:

CRT's: 21/22" (basically 20" viewable), the better the monitor the higher resolution/refresh rates you can run.

LCD: Minimum of 1600x1200 pixels, which typically limits you to panels 20" and larger.

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