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Think about this for a moment and refrain from jeering upon this idea - Try out to own a Canon DSLR as your secondary camera! As I mention before, there are always pros and cons of owning two camps. You have to be pretty specific what you want each camp to do for you.
And as far as Canon is concern, its divest glass range will definitely prove useful if you seek, say, a longer reach at 800mm (Sorry Nikon). I was just thinking along the line to get say the inexpensive Canon 500D I put off last week. Yes, its very primitive and yes, its shoddy in construction, but I am only seeking for the core sensor engine that's worth using together with Canon's vast offering of cheaper glass!
Well, its just a thought but one that definitely has a certain weight in the whole equation of hunting down a second DSLR body.