Up, up and away. That's what you might call Orlando's rental market, long regarded as one of the U.S.'s most affordable. But no more, as viewed by a new report. Apartment renters in the area are now spending more than one third of their incomes (34.3 percent) to pay landlords, according to a study by the RealtyTrac real estate research company. There's no let-up expected in Orlando rents, either....