D40 to D5100- how will IQ improve

I think I might do the same, when the time comes to upgrade from my
D5000 to a 700 or similar. Place a long zoom on the new one, and a
portrait lens on the old one or something similar.

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Coming to you from the beautiful Ozark Mountain Country
where if you're too busy to go fishin', then you're too busy!

You think I should change it to if you're too
busy to take photos, then you're too busy?