I love happy... the only other fragrance I wear is Calyx by Prescriptives.
Another Calyx fan here

Have you been to Bath and Body Works? A lot of fresh, light fragrances there that have a "Happy" vibe, I like their WHite Citrus and Sea Cotton. Very budget friendly too!
I'm highly allergic, so it's rare to find a perfume that I like that I'm also not allergic to. In addition to Happy, I like Dior's Tendre Poison. Good luck in your search...