Before I read the article you linked (good stuff by the way Laird) I was thinking "If Solaris isn't number one I'll reach across the pond and strangle The Laird!" LOL!
Though, if it were my top ten list, I'd trade out a couple of those games for a couple Imagic and Activision games not on it. But I bet if you stretched your list to the top 15-20, the ones I'm referring too would be on your list too.
But instead of doing my own top "X" list, and trying to decide what goes where (besides Solaris as number one and a few of the ones you did pick) I'll just name a few more that I feel deserve to be in anyone's 2600 collection, not in any particular order:
Cosmic Ark Moon Sweeper Atlantis Star Voyager
Pitfall 2 Star Master Robot Tank Enduro Racer Gran prix