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A decidedly old-school/low-tech response:

I have a scan-converter, which has a VGA pass-through, a S-video and a component-out. I run an extra monitor and a line to my TV.

The extra monitor looks fine, but a normal TV (like I've got) doesn't have nearly the resolution and/or my scan converter doesn't support the resolution or refresh-rate(s) to make an effective monitor, except for movies (what I use it for).

scan-converters probably cost about $40-160 these days (mine's several years old). Hope this helps.
 
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