AFS 50mm F1.8 G lens or AFS 35mm F1.8 DX G lens
FF is a full frame sensor and DX is the cropped. You can use an FX lens on a DX body, but not vice versa unless you want "lens vignetting" which is a black circular border around the image.
I have the AFS-35 mm DX lens and it's one of my favorite "daily use" lenses. The 50 mm is a great lens especially if you want to bring the subject in a "little closer" and isolate your subject a little with some nice bokeh (blurry background)
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Hope this helps a little.