I would go with the serenade of the nether as well, it has save me from the dreaded nether pump, can fit in one chunk and never requires movement. All it needs is a reliable source of LP.
Ohh and the lava crystal also from blood magic is fantastic for remote/independent smelting operations like a alchemical furnace(thaumcraft) or the witch's oven (witchery)
Oooh, oooh, the rite of moving earth from witchery. raise a collum of earth up and make a fairly safe sky base fairly early on.
Also let me be the first to say: I dind't know IC2 added a builder or filler, good on them!