Well, in my World, squid power has been the best solution. Even beeing mid to late game tier, you dont need to change much to such a system to make it ultimate. Squid power is one of the few things that got nerfed, because powercrystals has nerfed, because his mod MFR is like DartCraft more fun to the user because its making starter things easier and you can concentrate more on the mid to late game stuff. But for early power solutions, a clockwork engine and later a solar boiler isnt to much of a problem.