My experience from calibrating both is that CRT based RPTVs do not benefit from DVI/HDMI, and that component in many cases looks better than either of the digital formats.
From those who own both: The digital formats are quoted as looking better than component on fixed pixel, but not on CRT based. Don't limit yourself if you can still get your HD or HD scanrate upconverted DVD to come in via component. I don't think it will look any better on digital IPs on any CRT based TV, RP or DV.
I think component/RGB is your best shot on CRT based anything. That's what they were originally designed for, and it remains the best for them.
Digital IPs like DVI/HDMI were designed specifically for all digital fixed pixel sets, and didn't happen until all digital sets had become very prolific.