I am going to throw hat into this arena as well.

When I get the sci-fi line, here is where I plan to start:
Starship Wall mold #301
Starship deck mold #270
Laboratory floor mold #271
Cargo Bay accessory mold #302
Med Lab accessory mold #303

If I were to only go with 3 molds, I'd cut that list down to:
Starship Wall mold #301
Starship deck mold #270
Med Lab accessory mold #303

For the miniatures, check out Wizards of the Coast Star Wars line. They are the roughly the same size as the D&D line of mini's, and the 'medium' sized figures fit on a 1" game board.

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Naloomi