Used is alright but you have to know what your looking for and such. Think about dust or dirt on the sensor all pictures will have spots on them from that and cleaning the sensor is not something I would imagine you would want to do. You need to know what your doing and it's expensive to get them cleaned. A good deal can cost you more if it's not such a good deal after the fact. Getting this camera will do everything you would want to do and with some time learning better photography and actually being able to use all the settings of the camera it will get even better. My wife has one of these but the t3i and they are good cameras. And the price has just recently come down so they are a great deal.
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As a person who probably won't work professionally with cameras and just wants to take great fish photos The Cannon is a good start I imagine.