It depends on how much you like your ear drums.
The NF-F12s have proven that they are, and Tom's appraisals can back me up on this, one of the best fans for radiators around. At full speed, the Corsair SP fans may have the edge, but then they're going to be really loud.
The Monsta rads, although thick, have a relatively low FPI - the 'F12s would be just perfect, mate.