I am a turboprop First Officer working for a Mexican cargo company, I take home between 3,000 and 3,500 USD a month on average, captain salary on the same plane is around 6,000 USD. For the larger aircraft captains can make upwards of 15,000 USD a month, sometimes even more...as for passenger airlines FO's make anywhere from 2,000 to 7,000 on average and captains 4,500 to 15,000 on the big metal.
As for general aviation salaries, I know people flying mostly single engine props and twin turboprops and they make as low as 1,000 USD or less a month to 5,000, I don't really have a number for pilots flying corporate jets like Falcons, Gulfstreams and the like, but from what I've heard some of them are really well paid.