If you could only buy ONE of these stuff packs (for $5) which would you pick and why?

I'd always recommend Tiny Living. It's the only SP I've ever paid full price for and I don't regret it at all, in my opinion all the others are a waste of money even at half price. Tiny Living is a pretty good pack, I like the build buy a lot, the Murphy bed is nice and the added challenge of making small homes is nice.