What size are you planning to get pics printed to? You'll just about get an A4 print out of a 6mp sensor without noticeable drop in quality or interpolating too much, if you want to regularly print larger then you might notice the difference. We have printed full page photobook pics from my old D30 which is only a 3.25mp and that's not been a problem so far, so to be honest it's probably not worth it.