I have the opportunity to pick up a used Nikon D3 that is in pretty good shape (body only). I'm looking at using it for available light, wildlife, and sports. My question though is about the 12 megapixels (which just about every DSLR has moved past in the last 5 years). Any advice from anyone about this (particularly to what extent I may be limited by the 12 megapixels)? I don't blow up my work to tremendous size (and I've got a couple of good distance lens so for wildlife I can get pretty close--"fill the frame"). But stuff that was pretty revolutionary when the D3 came out (ISO range, performance in low light) are now attributes that a lot of other cameras may have caught up with. And while the FPS is a plus for me, I'm not sure if my next camera decision is going to be primarily about fps possibilities--I don't shoot that much sports. Advice?