Cepheus: Faster Than Light is just about all you'd need to play, but it lacks a few things you'd need to run the game. There is nothing on planet/system building, building your own ships or vehicles or trade. However, that's not a problam though as Cepheus Light is also "pay what you want", available here and that adds everything else you'd need!
I will add one nit-pick, though, and that is the lack of a Trader/Broker skill in both of Omer's Light versions of Cepheus. I typically run Merchant campaigns or, at least, the PC's are having to "do trade" to keep their heads above water and make their ship payments. :) I've decided that I'm going to add it myself at 1/2 the number of terms a character was in the Merchant career...1 term = Trader-0, 2 or 3 terms = Trader-1, 4-5 terms = Trader-2, etc. I know Omer included other skills for the find cargo / negotiate price routine, but I want something specific and I'm going to let the Trader skill replace any of the other skills used for Trading. This is just a nit-pick, though, as using Liasion/Streetwise/Admin/Carousing/Int/Soc would get the job done.
[4 of 5 Stars!]