generalstaff
Steadfast
I have a jpeg of the tech tree, right here. I should add that to my sig...
Saving to hard drive for future reference.
Upon review the Tech Tree, the future batteries should go:
Railgun -> Laser (Tech: Fusion, practical military lasers for defense would require a large, cheap power source) -> Anti-Matter.
Hopefully that plan is fine, (other than using redundant graphics for Missile through Anti-Matter batteries).