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I know I've made a few suggestions before but you can't go wrong with anything listed here. Lightroom and Capture One are good basic development tools. They don't replace photoshop for major work, but handle volume much better (especially LR). You might also want to consider Capture NX. It's Nikon's processing software suite and it does a very good job with Nikon files. If you're going to shoot raw, NX2 will reproduce the same look as you see on the back of the camera's LCD (since that's a jpg that's been processed by the camera).
IIRC, most of these suites have a free trial. Once you get your camera, download and try them all. Shoot raw and don't use "auto" and with a little practice, you'll be producing some nice picts.