Piece from the preeminent (at least in my opinion) "realist" journal, the National Interest that claims our fears of a rising China are overrated.  I think on some levels the analysis hits some right notes.  China will not be a threat to invade America anytime soon.  However, the potential threat it poses to allies in its neighborhood combined with any attempts (overt or subtle) to push us out of the Pacific is problematic.  Additionally, to be ill prepared for the unexpected always invites criticism after the fact that is worse than the criticism incurred by preparing before the fact.  Consequently, we should continue to be proactive and should follow something along the lines of what Helprin (referred to in the article proposes).  Quibbling over the exact GDP percentage is less important than agreeing with the core concept.