Maybe(when enpowered, the controls are something to think about, be sure not to make it complex, possibly v+number from 0-3/1-4), knockback resistant or "thorns" (shocking) armor, feather falling shoes,night vision or water breething helmet. Something like that, thats what i could think now. And of course use energy instead of durablity.
Theres 2 "bridge" mods what i found to be interesting:
Equvivalent Expansion, would be interesting to see minium stone came out from liqui transposer.
http://www.minecraftforum.net/topic/2541898-164forgeaddon-equivalent-expansion-v001/
And somewhere i found a mod with thaumacraft arg magica "integration". Magic powered dynamos.
it seems we will be able to make new packs, whitch are feel like one single mod.