Like I said to you down the mines the other week, I have personally tested the D90 against the then current Canon equivalent, exact settings and lenses, and the Nikon blew the Canon away every time. When my Canon died I had no hesitation in buying a Nikon replacement.
For info I use a D90 with the Tokina 11-16 lens, a combination I'm more than happy with for the last 5 years.