From the Tech; Resource Distribution Metrics, in order of abundance;
Elopor - 2,911,851
Andooweem - 2,427,405
Septerfon - 2,317,131
Epsilo - 1,987,661
Munteen VII - 1,918,597
Nasharil - 1,913,112
Vulpto - 1,204,960
Alturnik - 1,672,813
All the starter planets range between and 123,791 and 143,853, so you really want to stick to moons and ring worlds.