I haven't bought a single Nikon lens yet that's cost effective.
I have a - Nikon 60mm f2.8 micro, Nikon AF-S 70-300mm VR and Nikon AF-S 35mm f1.8 lenses that are not only cost effective but wonderfully sharp, well made and better than anything else for similar money.
I should have qualified my statement, boy do I feel sheepish. I should have said in the aperture range of f/2.8 and faster. I hope I didn't come off wrong???