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If I was going to make the 4th a member of an otherwise unrepresented cycle, I'd go with:
Azorius: Celestial Colonnade
Boros: Battlefield Forge
Dimir: Fetid Pools
Golgari: Temple of Malady
Gruul: Cinder Glade
Izzet: Cascade Bluffs
Orzhov: Tainted Field
Rakdos: Blackcleave Cliffs
Selesnya: Horizon Canopy
Simic: Hinterland Harbor
If you were going to go by best, I'd probably change:
Boros: Battlefield Forge -> Inspiring Vantage
Dimir: Fetid Pools -> Creeping Tar Pit
Orzhov: Tainted Field -> Temple of Silence or Shambling Vent
Gruul: Cinder Glade -> Raging Ravine (maybe?)
Simic: Hinterland Harbor -> Flooded Grove or Temple of Mystery