Best Video cable for picture quality?

Slightly off topic, but I'd like to improve the quality of the signal I'm getting from the wall into my digital cable box. This is 75 ohm coax I believe and I'm not sure what they call the connector they use (short, thin, stiff wire). Benefits to upgrading this cable? Recommendations?

I recently bought a pair of used Monster M2000SV silver series S-VHS cables from "Underwoodwally" (one of the partners of the Perpetual Technologies products). He still has some of these cables left for about half-price -- look for his ads here on Audiogon. The M2000SV series is the best that Monster Cable makes, and they have been highly recommended in several video mags.

Drubin: a good quality low loss wideband 75 ohm RF coax is RG-6, available from Radio Shaft etc. along with type-F connectors. I have not evaluated any other coax's regarding differences in picture quality, but I expect the lowest loss cable is the one that yields best video performance. Anyone else?

What kind of DVD player are we talking about? One consideration (which may or may not be relevant, depending) is that some of the new progressive scan DVD players (Pioneer for one, not sure about others) only run the progressive signal through the component outs. So, if you've spent the money to get a progressive scan DVD player and a compatible TV, make sure you're not short-changing yourself with either s-video or composit. I just ordered the new component cable from bettercables.com (based on recomendations from around these parts and a relatively friendly price tag) and am looking forward to seeing what it can do...