You sound like you would love the only nauvis mod. There are two types. One has no space but the different landscapes of vulcano, gleba and aquilo are distributed in the different cardinal directions. The other one just has the new planets as asteroid belts where you have to fly a ship there to collect, so you don't have any other planet. I really liked the first one to play through. All the new tech, but no hastle with the new planets.