KZL Worlds is a pack that focuses on enjoyment of the game while making sure there are not TOO many over powered things.
A huge difference in my packs compared to other so called Kitchen Sink packs is that I want the land to be unique and interesting to build on. So I tend to use mods that change the original minecraft landscape dramatically.
KZL Worlds will give you the ability to do what you choose, be it magic, tech or exploration.
Do you want tech? Well I focus on RF mostly, we have..
Mekanism
Thermal Expansion
Draconic Evolution
Deep Resonance
Extreme Reactors
..Plus lots more
I find that mods such as IC2 or Tech Reborn are over complicated to a point where they are no longer fun, if you want those look somewhere else.
Do you want magic?
Botania
PSI + Magical Psi
Wizardy
...Plus a few more
Do you want exploration?
RF Dimensions
Lots of cool places with Open Terrain Generator (Biomes Bundle)
Aroma's Mining World
You wont find Twilight Forest or Abysmal Craft in here due to they tend to rarely be used or not much fun in the overworld causing more bloat than necessary.