Ceos/Sothis.
Both systems are next to each other. Plenty of long distance hauling missions (legal and illegal), plenty of one jump missions between each other for easy rep grinding, sometimes you get one jump smuggling missions exceeding 3-5 millions each.
And bonus: there's a Fed faction in there, so Fed ranking progression happens while you get rich...and the Sirius corporation is in there as well, so you eventually hit Allied with no effort and get to unlock that Engineer.
Also Ceos has been brought online back from the failed UA bombing by some random dudes, and Sothis wasn't even taken down, so if MAs do immunize stations, they're good to go for some time, I expect.