Shun Cheung , Jan 07, 2010; 10:51 p.m.
How about Adobe LightRoom? Keep in mind that LightRoom 3 beta is already available. If you buy 2 now, you'll may need to upgrade and pay again soon.
PhotoShop, LightRoom, and NX2 are all avaialble for a 30-day trial. You might as well download the trial and determine for yourself. Personally I am not crazy about Nikon's software, and PhotoShop is overly complicated for casual users. That is why I think LightRoom is a good option. You can start with the LightRoom 3 beta and use that for free as long as the beta lasts.
But only you can decide what you prefer.