Good list - others I remember...
Phoenix, Galaxian and the above-mentioned Gorf were early modifications on Space Invaders and all swallowed significant money from me. Later excellent shooters included Nemesis(AKA Gradius)
Lots of money in my late teenage years was spent on two player games such as the excellent Midnight Resistance and Ikari Warriors (both games had rotating gun directional control on the joystick), Aliens, Punisher and Final Fight as well as multiplayer fun in the form of Ironman Stewart's Super Off Road and teenage Mutant Ninja Turtles.
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