Superbit DVD Price Break

[Defshep]

Okay, I couldn't keep myself away from Best Buy when I read about the Superbit DVD sale. They have a nice selection, all the SB titles, I think. It's weird that there was nothing in the local ad in the paper mentioning the deals. And the staff wasn't able to tell me when the $9.99 sale would end.
As I was checking out the titles, I wondered if it would be worth buying these editions if I currently own Spiderman, Spiderman 2, Black Hawk Down, Resident Evil, and The Patriot (2000 w/ Mel Gibson). How do the picture & DTS audio tracks compare to the previous prints and Dolby 5.1 surround versions I already own? I must say that I do prefer DTS to DD on most occasions, but I don't know how the awesome DD soundtrack in Black Hawk Down could get much better! Just looking for comparisons. Is it worth the extra dough for these films in particular?
Thanks!

P.S. I don't own Air Force One on DVD, so this may be the version to get.