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The only thing I would add to this is lens compatability, which is something very often overlooked with Nikon camera bodies by beginners.
Although a very good entry level camera in terms of its performance, the D3100 lacks a body motor. This means that you will only get autofocus with AF-S lenses. AF-D lenses will only work in manual focus mode. I've known of a few people who went with the D5000 when first launched and bought the 50mm f/1.8D (one of the best bang for buck lenses you can buy for optical performance), only to realise they can't achieve AF with it. You do of course have the option to go for the 35mm f/1.8 AF-S, which is about £50 more than the 50mm f/1.8.
Its basically swings and roundabouts. You either pay more for a Nikon with a camera body, which affords you the option of AF with older Nikon lenses, or buy a cheaper body and pay for the more expensive AF-S lenses later on. Point in case, 50mm f/1.8D £100. 50mm f/1.4D £200. 50mm f/1.4G (AF-S) £300. If memory serves, you don't have this problem with Canon EF lenses/bodies.
While not having a focus motor is not a problem for some people and situations, for others it can be a limiting factor, so bear this in mind when making your final decision.
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