Legends of Anglerre is a worthy follow up to Starblazer Adventures. The FATE system itself is a fantastic game engine. I have experince with it through Spirit of the Century. If you own Starblazer Adventures, you will appreciate the new ideas and improvements presented in LoA.
D6 Space is good but it does not fill the void left when WEG lost the rights to produce the Star Wars RPG line. There are some new ideas presented in th ebook based on the D6 system's growth over the years. The system itself does not get enough love in the RPG market.
D6 Adventure is a good core set of D6 rules for games set in the modern era. The system presented in this book is the result of the growth of the original ideas from the WEG Ghostbusters and Star Wars line from a few years back.
The Cortex system is the backbone of Serenity, Battlestar Galactica and Supernatural. It is a good, solid set of rules. The ideas behind the system will be familiar to anyone who has played games such as Deadlands Reloaded and Usagi Yojimbo.