I just took a look at Tekkit, there's actually another big update since I last checked and it brings out a deciion we have to make:
The two current versions they have are TEKKIT™ and Tekkit Lite. The newest one (Tekkit) has some new fancy moon mods or something, but IndustrialCraft is gone (;w
. That means the electricity system is gone, I'm not sure if it's got some other mod in its place.
Tekkit Lite is what I was talking about earlier with conveyor belts and all, it's roughly the same package with a few consistency tweaks and such.
I'll look more into what the new package does and doesn't have later, but for now my vote goes to Tekkit Lite because I really like IndustrialCraft.
There's also some new RPG modpack called Hexxit, perhaps we could look into that too.