Did you look at the modded Minecraft experience at all, before doing that?
The moment ic2 stopped development I lost interest.
Buildcraft spawned factorio however, so my logistic nerd needs are satisfyed :)
That said, not just any pack will do. My absolute favorite is TPPI2; I think it's by far the most professional one, but it does require a pretty hefty machine. If it doesn't work, then there are a number of smaller/more specialized packs that likely would.