hilltop
I bought a cheap cable for £10 sterling as I didn`t know this at the time. Still, the picture quality is good even at this price.
If you have a short cable of 1 or 2 meters then the most expensive cable will not help your picture. Long HDMI cables will degrade picture quality because it will start dropping bits and it will show up as white specks in the picture, The most expensive HDMI cable is limited to around 50-100 feet before you have to have some sort of repeater. You can run the RGB component cables longer distances without picture issues. My longest HDMI cable is 50 feet which is the distance between my AV equipment and the Projector.