George,
Not sure about Denon, HK, Sony, and some of the others, but I am pretty sure Onkyo, Pioneer, and Yamaha have sleep timers.
That said, some of the ones you may want to look at would be(in no particular order): Pioneer 1015, 1016, Elite 80....Onkyo 603/604/702/703.....Yamaha 657/757
Of those, my preference runs Yamaha, Pioneer Elite, Pioneer, Onkyo. But as always, ymmv.
Regards,
Jeff