Well any pack that has Gregtech and/or RotaryCraft/Reactorcraft/Electricraft will cover your hard tech. I don't usually play with these mods, so I can't suggest anything...
Magic packs are plentiful, so you may want to see what you can find over in the 3rd party pack area
Hard tech and magic? I have the very thing! I have a modpack which is purely Reika's mods, which includes rotarycraft and such, but it also includes Chromaticraft, which I believe is exclusive to my modpack!
There's also a monster that makes scary noises when you're near bedrock. so spoopy!