>> On a side note, which is supposedly better, 720p or 1080i?
Largely dependent on the source and TV. 720p is generally said to be better for fast motion sporting events. 1080i is generally perceived to be a tad sharper and is great for shows like Jay Leno.
Real world examples include the NFL Playoffs on NBC and Fox. Fox uses 720p and their games typically show less crowd pixelation (sometimes referred to as mpeg artifacting) during fast pans compared to NBC. NBC broadcasts in 1080i and their static images (think booth shots of Al Michaels and John Madden) appear slighter sharper than on Fox.