Who do you get your T.V. service from

[joepole]

480i is regular, standard definition TV. There is no 720i.

720p is the minimum to be called "HDTV" and most broadcasts are in 720p or 1080i. I personally prefer 720p but there's not really much difference.

Satellite generally has the worst (i.e. most compressed) HD signals. Cable is generally a little better and over-the-air broadcasts are the best.