Knights of the Old Republic is like the Dark Side, right now. It's just more tempting.
On the other hand, I'd so pick up Trine, but not as a pack. I would've picked it up as an individual sale, though.
I also would've vouched for Defense Grid. I have that on the 360. No matter how you slice it, it's one of the coolest tower Defense games I've ever played. The presentation is pretty awesome too. It definitely wowed me at a time when I thought the Me-too Tower Defense games were getting stale.
I think I'm really digging good Sci-fi tower-defense style games. I'm also loving Space Station: Frontier for iPad, though that one hits a few RTS elements usually not in TD games. Challenging though.