Ok I guess I'll tag along, I selected the wrong thing on the poll but I'm for it.
First of all we need some melee units.
Plasma Warrior - a guy with an armored suit, and some energy/plasma based sword-like weapons.
And laser gunners is not future enough, the U.S. military already has some leaser weapons, how about an upgrade be particle weapons in which they research weapons like phasers, disruptors, other energy weapons.
Next, spaceship is way, way, WAY, too cartoonish, little kids use that term, a correct reference to a spacecraft that would fit into the Glest screen is probably shuttlecraft, shuttlepod, fighter, small fighter, ........there are probably quite a few more references to a ship like that, but what I named is plenty.
Bazookas, would send a guy flying if he were standing on the moon, how about a particle cannon guy that would launch a particle beam, a massive particle beam, that would do tons of damage but would take forever to fire.
I have a lot more I could say, I need to see an updated list of the current units.