If you please, I'd like to throw this in here. IMO, and based on about 15 years of being "into HT" (not necessarily being able to afford the good stuff though)
1. Anything smaller than a 25" is called a "computer monitor" and you really don't need to worry about S-video vs. Component. Yeah, component is best, but you won't see a damn bit of difference.
2. Larger CRTs (32-40 inchers) There is a 100% difference b/t composite and S-video. There's about a 50% difference b/t S-video and component.
3. A cheapie smaller TV will look 109x better than the most expensive TV on the market if it is
calibrated correctly! and the big TV isn't/.
Calibration is very important. 100% of all consumer-grade TVs (yes, even my beloved XBR 800 WEGA) are setup incorrectly from the factory. You need a test disc, like the one I linked to in order to properly set it up.
A buddy of mine has a cheapo 36" Sharp CRT w/component inputs. He is not a videophile/audiophile by any stretch of the words. His TV is setup with the white balance cranked almost to max and the sharpness cranked as well. It looks like you know what.
My TV has S-video only inputs. No component. But I've calibrated my set using the disc I linked to, above. It looks damn good. Not as sharp as a good, calibrated set using components would look, but damn good.
I'll hazard a guess and say that 99% of you that only watch DVDs on your PC's monitor cannot tell the diff b/t S-video and component video inputs, using the same DVD on the same TV.
Most folks that are "into" HT can, however. I wish I could afford my XBR.