One of my D300s went kaput. While I will send it to Nikon, meanwhile... if it makes sense to do so, I am thinking of replacing it with a D3s. So, what would you do if you were me? I like the DX factor for wildlife. I will be going to Africa, again, in May. Will the shots be acceptably good (noise free) beyond ISO-1600? Other salient factors that I should be aware of, pros and cons? Also, any credible likelihood that Nikon will release a replacement for the D3s or D300s soon? Thanks!