My current spacer run:
MN-3890389739041803455
75% hazard Terrain world in Beta Onora:
Extensive Ruins, Bountiful Farmland, Moderate Rare Ores, Moderate Ores, Trace Volatiles, Abundant Organics
Everything you could want in a self sufficient colony (Industrial planning 2 and no cores means you have enough of everything). Only lacks a Comm relay.
Also has a 100% hazard Desert world in the same system if you want to stack defense fleets in one system (although hit only has Poor Farmland, Moderate Ore, and Common Organics)
Nearer the core, there's another 75% hazard Terrain planet in Maan-Emo, about 5 ly from Zagan. Extensive ruins, Bountiful Farmland, Spare Ore Deposits, Abundant Organics.
Edit: Per Midnight Kitsune's suggestion, Beta Onora is south west of the core in the Onora constellation, and Maan-Emo is closest non-core star to Zagan, north east of it.