I wouldn't touch the Nikon or the Canon, you give up more quality as you go longer on the zoom range and 42-50 is extreme. The superzoom game became one of constant one-upmanship where the #X mattered more than quality.
Mucka I understand you want a long zoom but 600 is a very long zoom, 1,200 is bordering on absurd for such a camera. When you were there last time what camera did you use?
Another vote for the Fuji, this is their market historically