Nikon just released NX 2. Its a 60 day trial version. I use NX and I find it be the most user friendly processing program to date. Some may differ but f u.
If you haven't used NX before, give this a try. Its a Phenomenal program for beginners to Pro's.
Nikon Imaging | Global Site | Capture NX 2 Trial Version ? Download
Not available for mac yet. Sorry.