Which D300(s) replacement?

... I still am amazed at the AF capabilities of my D300. However, I sometimes print landscapes/scenics at 36" for clients, and I'm pushing the envelop with my 12MP as I go through the re-size process. I could use the extra pixels on occasion. That would also allow me to go to bigger prints with wildlife images which usually require cropping. If I can get a few other "improvements" as well, I'll gladly accept them ...

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Ron Wrucke (Va Eastern Shore)
http://EasternShoreImaging.com