Here's the one problem I see with the "720p is better for sports" debate, although the argument makes sense the problem is nobody ever accounts for the "human element" of filming sports. Sure you may "see the puck better" with 720p but 99.9% of the time the camera man can't keep up with all the action to make it worthwhile.

Then look at the "fastball" statement. Pitches are broadcast from behind the pitcher. So although a fastball is clocking high 90's approaching 100+ mph the actual on-screen movement of the pitch is very slight from the pitchers point of view.

There are hosts of reasons why one would technically prefer one over the other or whatever but basically it all comes down to the quality of the set. I don't have the best stuff but it's pretty decent stuff and over the years i can honestly I can probably count on one hand the times I've seen something that was egrigous such as stepping. Infact only once have I noticed it where it actually caught my eye when I wasn't concentrating to see it. And that was watching an episode of family guy where Stewie moved his head and there was a visible stepping artifact with his head.

The things that will bother you the most are the things you have no control over. Station quality and bandwidth.