regarding AE-quartz from overworld: I got nearly 2 stacks of ore blocks out of one full size mine (plus walls). maybe the quartz generation is biome depending, although I didn't read anything about it.
regarding the nether as mining location: in ultimate, virtually everything in the nether has its value, even netherrack but powercrystals netherores add a lot of value, like the gregtech netherores do. and we shouldn't forget the lava (especially together with the ind. centrifuge).
one thing regarding AE: is it possible to priorize recipes? like it is possible to make mixed metal ingots with various recipes, but some of them use cheaper metal ingots (like aluminium or zinc), but if those aren't available, the system should switch to other metal ingots.
regarding the nether as mining location: in ultimate, virtually everything in the nether has its value, even netherrack but powercrystals netherores add a lot of value, like the gregtech netherores do. and we shouldn't forget the lava (especially together with the ind. centrifuge).
one thing regarding AE: is it possible to priorize recipes? like it is possible to make mixed metal ingots with various recipes, but some of them use cheaper metal ingots (like aluminium or zinc), but if those aren't available, the system should switch to other metal ingots.