Of all the Stuff Packs that I think are worth getting, I would choose Perfect Patio, Cool Kitchen, Romantic Garden, and Vintage Glamour due to their included content (Hot Tubs, Ice Cream maker, Wishing Well, and Butlers respectively) as well as Kids Room and Toddlers if you play kids or families. The other Stuff Packs on the list, I'm not sure if spending money (unless if it's a sale) on the others (Luxury Party, Spooky, Movie Hangout, Backyard, Bowling Night, and Fitness) would be worth it.
Keep in mind that depending on preference, some Stuff Packs may be useless to you. For example, Kids Room and Toddlers (and the Parenthood Game Pack) are useless if you only play Households with Young Adults through Elders while Romantic Garden and Backyard are less useful in San Myshuno due to the Apartments since they're indoors although Penthouses can be used to workaround that.
