gaming need some tech themed minecraft mods please 1.6.4

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Me and my friends are tired of Tekkit, so I offered to compile a few mods and make my own tech themed modpack, I figure that since it's for personal use I don't really need to worry about permissions. We had the most fun in tekkit planning out the layouts of pipes and machines, an making complex redstone devices, and factorizing everything so we want some tech themed mods in the pack. 1.6.4 only please.

I already have IC2, computercraft, and buildcraft.

Any suggestions?