First Idea: Railguns!
Does 100 damage(I know thats overkill, but it punches through anything it kills/destroys). Can be backpack or turret mounted. Uses 5-10 million EUs per shot. Destroys all blocks but bedrock.
Rails:
:Iridium: :Iridium: :Iridium:
:MFS-Unit: :Iridium: :MFS-Unit:
:Iridium: :Iridium: :Iridium:
Barrel:
:Coolant Cell: :Coolant Cell: :Industrial Diamond:
:Glass Fibre: :Glass Fibre: :Glass Fibre:
:Coolant Cell: :Coolant Cell: :Industrial Diamond:
:Glass Fibre: = Rail
:Industrial Diamond: = Lapotron Crystal
Backpack:
:Mining Laser: :Industrial Diamond: :Industrial Diamond:
:Reactor: :Quantum-Bodyarmor: :Industrial Diamond:
:Mining Laser: = Barrel
:Reactor: = Lap-pack
Turret:
:Mining Laser: :Mining Laser: :Mining Laser:
:MFS-Unit: :Iridium: :MFS-Unit:
:Iridium: :Iridium: :Iridium:
Any other ideas?