The only time you'll see a difference is if you're viewinging your images at 100% all the time. A lens that's going to look bad at regular vewing sizes is going to be equally bad on the D40 and D7000. And there are many many many "consumer" lenses that are perfectly adequate for a 16MP sensor. The 35mm f/1.8 G, the 85mm f/1.8 G, and even the older 85mm f/1.8 D are all excellent consumer primes. The 16-85mm f/3.5-5.6G IF-ED VR is a fairly decent consumer zoom too. All tested on the D7000...
The thing about resolution, is what you see in the charts doesn't always translate so well into the real world. The Canon 70-200mm f/2.8 L IS USM II is meant to be much sharper than the older version, particulary on a crop body. I've used both on the 7D - shot several thousand shots on each. Don't ask me to tell them apart though.
I can't argue agains the D90 though. Especially not at the price it's going for right now!











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