Most packs are too complicated, too laggy, and focus one just one long term goal. No more, with less than 60 mods Interstellar Warfare manages to to hit both of those goals.
Want to build a rocket and go to space with your friends?
Want to blow up those friends with a nuclear missile?
Want to build a factory to do the either of the above?
Go ahead and do it. With Mekanism you can make a factory supplied by a 5 times ore processor fed with power from a big reactor. Because of minetweaker and some custom configs you can then use that byproduct to make missiles to blow up your friends!