Damn. I would have helped to relieve you of that Trinitron.
I looked into the SCART/Component conversion options and found that to be fairly reasonable in price, BUT with the amount of consoles I have it would have been a major investment in cables/input switches/etc.
I had a 720p LCD given to me and decided to pull it out and see what happened and was surprised to find out that the composite and s-video inputs actually look fairly decent with the exception of the NES. The NES composite looks like absolute garbage but the RF looks better (thanks, Nintendo).
As for my PS2, I tried out a component cable and didn't see much difference over s-video. It looks as good as can be expected on that 720p Vizio screen.
If I can find it again, Ben Heckendorn detailed the steps to make a custom A/V input switch. If I decide to go the RGB route, I may save myself some cash and build a switch panel big enough to handle all of my consoles. At this point... I spend more time messing with my hardware than I do actually playing it.