Forgive my ignorance...

I'm confused as to what types of connections are the best (visually and audibly) for my HDTV, hometheatre and stereo system. My components are all 1-2 years old and of good quality such that they offer a myriad of connection choices.

Can someone provide me with a "Good, Better, Best" breakdown for all the different connections possibilities along with an understanding as to why?

Also, is it worth buying an upgraded cable for the run from the wall into my DirectTV HD receiver?

Thanks!