Widescreen is the way to go. If anything you are future-proofing your dvd's because widescreen tv's are taking over. And those full screen movies look worse on a widescreen tv. You'll have to deal with "black bars" on the left/right sides of the screen or perhaps zoom in to fill the screen.
Also...
"C" means clearance which means that Best Buy is not going to replenish that item. Prices then usually drop to get those items out of the store.
I work there.