Here is what I think about Conon and Nikon from my limit experience with both of them
I have use Nikon 995, 775 and Canon G2, S30.
All 4 models are very good, but Nikon has better Micro focus then Canon, and Pics seems to be a little sharper then the Canon's
I feel Canon's color a little warmer then Nikon, and I like it.
However, Canon is a little easier (995 vs. G2) to use than the Nikon, better looking, and handle.
Nikon's camera size is a little harder to fit in my pocket (S30 Vs 775).
Overall, You can't go wrong with any one of them...
The reason that I am buying the 2500, is couse it is smaller then my current G2 and easier to use. 99% of my Pics are done in auto mode, and I need an idiotproof camera for my wife and me.
As far as review goes, it only told you the major problems/advantages, all canon and nikon's camera in my view is very good, for the minor issus you have to try it yourself.
Of couse, it just what I think, you may feel totally different when you use it....