As it looks now.. San Antonio. They have been playing extremely well so far in the regular season, and I think they can up their level a notch or two, especially defensively. In the games I've seen them play they have been limiting the minutes of Duncan, Manu and Parker quite a bit, which just makes their record even more scary.
Even with someone who's very battle tested in Perk, I don't think OKC are ready just yet - but they definitely became one of the major winners at the deadline. I doubt they'd be able to go through either Dallas, San Antonio or the Lakers with their rather two-dimensional offense. Outside of Westbrook and Durant they don't have much that I'd be afraid of.
I agree with San Antonio--but they have to stay healthy. I also may be underestimating Dallas, but I can't tell if they're for real come playoff time...
