What PPV channels are actualy available depends on what Dish(s) you have installed.
With the old standard dish300 (18" single sat) you get 10 or so channels.
(I haven't had dish for a year now, so I forget the exact #s)
With the new Dish500 you get a few more.
With a dish pointed to 61.5 or 148 you get HD-PPV and a few more channels.
I don't think you get different movies, just more times to choose from.