Gold throw! It's thrown in a parabolic arc, and flattens ground units for high damage, also hits air units and may knock stuff into each other (think momentum missile mayhem), but costs...500 money...
Money cannon is for bank...and each money is raised to 25-30...
How? (Make a new unit called thief and it will steal the money =P)
That'd be a great new unit!
It would have the same HP as a marine and be 1.5x faster than a marine, once it reaches the enemy base(It can't be hit by the defences)it would steal 1 Money every second.
Sure the Theives would have abit lower damage than Marines and Fire that should be sort of like a Kamikaze Unit which can cause massive splash against enemy units but kills itself.