Thanks again NY152 - I had no idea they were different DVDs! I thought the Revisited DVD is the Matrix with an extra disc!
Well, so far I have a short list:
a. Buffy the Vampire Slayer (seasons 1 and 2)
b. T2: UE
c. the Matrix
d. M*A*S*H (seasons 1 and 2)
Thanks Aeris - I have checked out that thread (as well as "Whats your first DVD purchase") - all informative for me (almost 90% bought the Matrix).