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7D is heavier as it has a metal frame as opposed to the plastic and polymers lower down the range. In terms of use, the 60D is not disimilar from the 7D (although you might consider the focusing options and higher frame rate of the latter to be crucial). The lens mount on the plastic bodies is stronger than used to be the case, so you should have no problem with all but the largest lenses.
Going back to the original question, the Canon is probably the cheapest and most convenient way to reach 400mm, although the prime options (400 or 300+1.4x) will generally produce a slightly better IQ.
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