There is a way that a color monitor makes a significant difference in the life of an IG2 player. Even with a space gun installed, your space cannon increases your chances of a space fight. It is worth building several smaller ships of the same class, the numerical superiority can be useful.
With deep space radar, provided it is developed, we can keep an eye on other empires. It even flashes sometimes when we are approached with a fleet camouflage. If your opponent cleverly colonizes your planet with rocket forts, rebel is recommended instead. Who knows how much a planet can handle.? 🙂