Well, since I was born at the very end of 1979, I missed out on most of these.
However, in another thread (the "FIRST!" thread perhaps?) someone talked about the staying power of Space Invaders. Even in the late '80s, I could find a Space Invaders now and then as an 8-10 year-old. So, I guess by default, it would be that one. Though, I agree with some others that SI may be the start of the Golden Age and I would consider more in that category...
...but, being younger than probably most of you, what do I know and I will defer to you guys!