I would buy Lego Lord of the Rings is it had non-local co-op. I'd play that with my cousin for sure, and maybe with my little brothers next week.
I also had it in my head that I'd buy AC IV if it went on-sale, but now that it is...$45 is still too much, considering I haven't even played Brotherhood, Revelations, or III yet (have Brotherhood and Revelations on 360, just can't bother to play them).
I'd maybe have bought Black Ops II (which I have on 360) if it was 75% off, just to play it with my dad on PC, but it's not worth it for $30.
Finally, I voted for Civ V over The Stanley Parable, simple because The Stanley Parable was already discounted more than that earlier, so I can't convince myself I'd buy it for $10 when it was a bit less earlier. However, I have no strategy game to play, so I'd maybe get Civ V to fill that void.
Today looks like a bunch of "if it was a LIIIIITTLE better" deals. Just have to make the Dark Souls purchase official.