Hi again Yorri;
Boy; this seems to be our day.
I went through the same thing with analog cable (poor image quality) then digital cable (better image quality), then DirecTV satellite (the VERY best).
There are four possible outputs from a cable (or satellite) box, one is very poor and the other three are very good to excellent.
1: Single RF coax output... carries both video and sound; poorest quality in both video and sound (no 5.1 surround sound). Stay away from this one. It is considered as only a basic connection and usually has a poor, sometimes fuzzy image.
2: Composite video output... separates the video and sound. Has much better quality in both video and sound. Is quite usable for everyday viewing.
3: S-Video... like Composite it separates the video and sound. Better quality in video and much better quality in sound (has 5.1 Surround Sound). On a computer, I do not see much picture quality improvement over Composite video output, but it does have real 5.1 Surround Sound. This is the one I am using and am very happy with it.
4: Component Video Connection... breaks the video into three separate components. You must have a Component input box and is most often used with HDTV. This is the very best image possible.
Do you by chance live in an apartment? I do, and had nothing but problems with so-called digital cable. Only channels above 100 were actually digital. All the channels from 2 through 99 were still analog and carried all the problems of analog.
I finally bit the bullet and got DirecTV and am now in hog heaven. DirecTV is the very best, on ALL channels and is VERY reliable. I also saved so much money with DirecTV that I got Showtime for DirecTV and still had enough money left over to get SBC DSL. Boy, that was a deal.