Wade has had a better career than Harden, but I'd take Harden of the last couple of seasons over any Wade season and wouldn't give it a second thought. And since I expect Harden to end up with numbers in the same general range if not better, I'd easily have Harden ahead of Wade. West to me was a clearly better player. So at best I'd put Wade at 5. I haven't gone deep enough to really and truly compare Wade to Iverson, Drexler, Allen, Maravich, etc. And yeah, I think Maravich is often overlooked. I mean can you imagine what his scoring numbers would have been with a 3 point line. He probably scores around 40 a game at his peak (though walking away at 32 doesn't help his career numbers).
This of course assumes you call Oscar Robertson a PG and not a SG. There has been many a discussion on what position the Big O played as he often was on the court with a more traditional PG (and a smaller player) and he rarely guarded the opposing PG, especially the last half of his career.
So I'd say 5-10.