Re: The World of Narue
I read a number of van Vogt books earlier this year. Slan was easily my favorite and I also liked the sequel that Kevin Anderson finished after van Vogt died. The Weapon Shops of Isher was also very good as was The Voyage of the Space Beagle. I wasn't as fond of the World of Null-A, but thought it was okay.
I read the first three volumes of World of Narue when they came out long ago. I never saw the fourth and fifth volumes, but would probably pick up the rest of the series were it to see the light of day in the US again.