HD AND NON HD TELECAST

I Have been shopping for a flat Screen and have been bouncing between the Formats. I really like the Sony Bravia in LCD.. The Sony Wega in RP... But was kind of still leaning towards Plasma when I strolled into a Video store the other day and noticed how poor the Plasmas looked on one wall... I asked why the veil look and he said they were watching a movie. It wasn't HD.. The only plasma that looked good was the Pioneer Elite. I watch a lot of DVDs and non HD telecast... Is there one format that is better than the others in non HD?

Thanks,