We had the space-station with the two blue-clear pod things on the moonscape platform. It was quite cool. We also had several of the rovers with the dual baloonish tires x6, the bendy claw thing on the back, and the communication dish on the top, which we referred to as "The Scrambler" We still have most of the parts from every set we ever had.
The Galaxy Explorer is a little sparse on the front end for my liking. I think I would have elongated the cockpit area, and then plated it with the smooth-topped flat pieces.
Looking back the galaxy explorer is somewhat dated, but 6 year old McNevin thought it was the coolest thing ever!
I had a moon station thing, with a tram that went out to the spaceship launch pad, it was quite neat, ill try and find a pic. That was my greatest space set. Well that and the 2 part vehicle, that could drop its dockable research station and continue exploring. Ahhh the engineering feats of legos.
Our base was like this: http://guide.lugnet.com/set/6930 Except ours had two of the blue things, and looked a little more refined in general. Couldn't find the exact one on the site. (may not have a pic for it or something)