Thanks for all the feedbacks. I will take into consideration all your inputs.
Here's my answer to some of the replies why I am converting to Canon:
One of my reasons for converting to Canon is because Canon's prices tend to be cheaper then Nikon's. I can actually get a full frame DSLR and with better specs. The Canon lenses, overall, are cheaper than Nikon's.
However, I am still in the midst of doing more research before jumping into Canon, at least if I am able to sell my D90. Otherwise, I will just carry on with Nikon for the time-being.
I appreciate all feedbacks and will take into consideration every input you have given me.