Blacktron Message Intercept Base was the representative of the "Blacktron" line (cira 1987) when it was the "Renegade" that really stuck with me.
(Here's the video for that- JANBRiCKS has pretty good coverage, hadn't heard of them before.)
For my money, this is when Lego Design first start getting cool - this ship, with its asymmetrical design (probably inspired by the Millennium Falcon, come to think of it), swept-forward wings, and that distinctively Triforce-ish logo. (Not to mention the Pilots with their cool opaque helmet visors) Before this, I felt I could reliably make cooler designs than the original sets, years later I certainly couldn't, and this set represents the transition. (Also, this ship DID sort of make the cut in the book, on a special page about the whole history of the Lego Space series.) 2 years later they'd finally start making cooler windows (see 6781: SP-Striker vs Renegade's clunky yellow cockpit) but I really think this was the turning point.
Space Lego was always special to me - Lego is the best "CAD" kit kids have for good-looking solid 3D design (Erector and K'nex are superior in some ways, but everything looks skeletal and wireframe) - I mean now kids might have 3D printers and Minecraft and what not, but then, this was it! Also, besides my Star Wars- and Trek-fueled excitement about the future, I knew that today's Towns, Castles, and Pirates didn't have little round studs on every surface... but the future MIGHT - so in that way the sets were "more realistic".
Oh, and here's a history of lego bricks- the book had a page on the history of the bricks thmselves, but didn't really mention when the "tube" design in the mix Part 1 and Part 2
Also I had this grand slam Christmas Gift in 1984 - Robot Command Center - - LOOOOOVED those grabby arms
What this world needs is Studio Ghibli Lego Sets- My Neighbor Tortoro and Porco Rosso and Nausicaa especially.