Resizing A900 High ISO

[Mike-Photos]

Hello
I'm playing with some A900 high ISO shots in LR2.1, as per David's suggestion, and they look very good resized to 12MP.
Of course, there's still some noise at the high ISO settings. My question is, should one do noise reduction in LR before resizing, should one do the NR afterwards (I use Noiseware Pro), or both?
While I could experiment, the conclusions I get to may just work for these few shots. I'm sure someone knows why the correct method is better.