Hi. Both cameras are much the same, both zoom to over 800mm and have Image Stabilisation. The Canon seems better specified but is that worth an extra £150. I haven't heard of the new Fuji you mention, but as a Nikon user myself I'm biased anyway and would opt for the P500. I bought my D300 4 years ago and still love it to bits, it's awesome and very reliable, not one problem. Try going in store and hold your choice in your hands to get a feel of them, often this makes a difference to any preconceived ideas. Good hunting.
Humility is an endearing quality and gains many friends, whereas arrogance loses them. Mike, 2012