/ Most robust DSLR (<400 body)
I am not up to date on the recent models, but some time ago all the Pentax DSLRs were waterproofed (provided a special non-kit lens was used) and quite sturdy. The K-30 seems to be in your price range: http://www.pentax.jp/english/products/k-30/ This would tick off the water resistance/dust resistance...
However, when it comes to repeated dropping..... ;)
Pentax K-30, in your price range, or Canon 7D or 1D series, which are not in your price range.
Nikon and Canon and Sony do nothing remotely weather sealed at the budget end of the market.
You'd quite easily pick up a K5 used for £400 or even less these days. I was toying about upgrading the the K5IIs, but couldn't justify it as yet, maybe next year...
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