I like Science Revisited quite a bit. It reorganizes the science stuff, adds a few things, makes unmanned science a bit more worth doing, and does some general balancing. Be careful about adding science stuff to your game though. It's easy to unbalance things to the point where you might as well just be playing in sandbox mode. A couple high science experiments that support biomes... and suddenly that single mun trip has unlocked most of your tree. Kinda takes away the fun. I'd stick to either a single science revamping mod, or adding one or two singular non-biome experiments... or one biome sensitive experiment.