Having always used Nikon (I have a D7000), I just cannot get over the fact that the zoom ring on the Canon lenses turn in the OPPOSITE direction to what I'm used to! So it is for this simple reason alone that I would recommend you stick with the Canon system if that is what you are familiar with.
According to the Camera Price Buster website, the 550D/18-55 kit can be had as low as £510, a significant saving over the D90 equivalent (£600+).
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