Yes. No point in going with a watercooling setup if you're just going to run a single 140 radiator... just get the NH-D14 or Prolimatech Genesis for approximately the same price as a watercooling setup using a 140 radiator.
Well, what I planned on doing is running a dual loop. Triple rad for my 580s and then a single 140 for the cpu. I just wasn't sure if it would be enough cooling power.