Re: GURPS Space campaign setting
I love Far Trader. If your campaign requires a detailed interstellar economy, get this book, learn the basics, and modify it for your setting. It's much more involved than the economics section of GURPS Space. I think it was the first Traveller book I bought and I have never regretted purchasing it.
First In is a bit more complicated. It describes the IISS, and has some ships, but much of the book is taken up by the Star System generation, uh, system. In fact, the chapters Stars, Worlds, and Cultures run to about 75 pages, and much of that is reproduced in the new GURPS space. Its a good book, but unless you're planning on running a Traveller IISS campaign, I'd think about what else you could get for the same money.
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