Thetwodud: I'm under the impression that the buy one get one free deal is only valid on the first order, Stopit.
I hear much more about Sacrifice than any of the other games on your list, osifracrat, which is probably why it ended up as my first purchase (I already own a hard copies of the Fallouts). As BobsRevenge said, it looked like a safe bet to me.
Haven't played it yet, but judging by what I know it looks to be a fun strategy-action hybrid.
I'll test that theory tomorrow most probably, you may be right.
Either way you choose though, most of these games are gems that deserve to be played again.
Edit: You are correct, ah well, the pricing is awesome enough already :)