Use the best signal you have available from each device.
When the cable box shows up, HDMI would be nice but will you be upgrading the service to HD?
Why I ask is the usual cable box with component output was usually 480p.
Bob
Just bought a Samsung LN37A450 to replace an older tv. Connecting it to a Sony Stereo/Receiver STR-DE345, Sony CD/DVD Player DVP-C660 (both are about 5+ yrs old) and a Magnavox VCR Player (probably 5+ years old also, but don't have model). Cable company doesn't have a cable box available with HDMI connection so have to use component video. Plan on leaving the current connections the same between DVD and VCR player and my receiver. How do you suggest I connect my tv to receiver and dvd player? Would I get a better picture if I return the cable box and get one with HDMI connection when it is available?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic