I gotta go with Lebron and Kyrie. I agree with Roy that Lebron right now is far removed from the rest. I think some people are also slightly underrating Kyrie. He came up huge in the Finals for them last year and he is the defacto closer on Cleveland, and plays great D.
After the Durant move to GS, seeing how he and GS have performed thus far, and how well Westbrook and OKC have done, I have to change my opinion on Durant, he is slightly overrated now imo
I mean, KD's having probably his second-best season ever, behind only his MVP year. I think, if anything, he's just proving what I've thought all along for the last two seasons, despite popular sentiment changing in light of Steph's rise: he's still the second-best player in the world.
That said, on paper, Steph and KD should be a better duo (LeBron > KD > Steph >> Kyrie, in my eyes), but I think Kyrie's started to narrow the gap some between him and Steph. Partly through his own improvement and partly because Steph is "merely" playing at an elite level rather than the transcendent level he was playing at last season.
So LeBron and Kyrie it is.