Thats great that at 75 feet there was no drop in video quality. Did you say it was a FLAT cable for component? Do you have a chance to actually compare a DVD image through a DVD player in a PC via computer cable to your projector and see if there was any difference in video quality on component vs computer RGB?
I might have to go long with my video signal but I will need to find a place that will spec maybe 50 feet of computer analog 15 pin cable. Or just go with about 40 feet of Digital Coax for sound and place my HTPC closer to the projector.

Saturn