I'm sure there are some NBA players taking HGH, because it is easily available to people with money, there is no testing, and hey, it might help. Getting caught would stink, but not getting that huge contract would stink more.
That said, does anyone who follow Euroleague know what the testing situation is over there, and if players fail with any regularity? The Olympics actually has real testing, and I can't think of a basketball player, NBA or otherwise, who's failed one of those tests. It's possible that basketball players might truly benefit less from PED's.
And not to cast suspicion on anyone who doesn't deserve it, but if Greg Oden takes this year off and comes back healthy, I'm going to wonder. The best argument for HGH is the restorative abilities, and if anyone needs a magical elixir, it's Oden.