I agree - that would be a good idea. Not a thread, but maybe a sticky in the monitor/video forum showing pics from different display types. The problems I think you'd have are
1) Different people taking pics with different cameras will produce different results
2) Looking at my pics as an example, say the VPinball shots, the digital picture shows mega scanlines when in fact there are virtually no scanlines. That's because of how my TV (most TV's) display the screen vs. how the digital camera works. Bottom line is what you see isn't what you get.
Really, it depends what kind of result you're looking for, what you're going to run on your cabinet, also how much $$$ you want to spend. The TV works great for me, but maybe not for you or someone else.
The pros & cons of different display types are well documented in the monitor/video section, but I still think it would be neat to have a post as you suggest to have screen shots of different types of displays!