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Simple 1 answer possible, the Canon 5D Mk III, but the 600D is also nice.
http://snapsort.com/compare/Canon-600d-vs-Nikon_D3100
The T3i is far better than the D3100. The picture quality and resolution of the T3i match the 7D.
The real comparison for the D3100 would be the Canon 1100D.