These aren't really favorites, as much as usuals, if that makes any sense:
CL 1-4 Nav Salvage Ring - High Earth
CL 4-7 Nav Crispin something (due north of the solar array) - High Earth
CL 7-11 Infiniticorp Campus - Earth
CL 11-17 Captain Holmes' Hideout - Slayton
Nav Slayton 1-4 - Slayton
CL 17-22 Nav LaGrange 4, 5 - Carpenter
Scuttle Bugs in Shepard, Nav unknown
Thats about as much as I can give you, as I am only CL 25 right now, heh.