K10D, K200D and K20D are extremely cheap these days, and WR.
D7000 is sealed too, although I doubt it's as sealed as your D800 or the pentaxes.
If you have the money, go with the K-5 or K-3 though.
Also remember that lenses are a huge part of the WR equation. At the moment Pentax's WR lenses are either high end DA* or kitlens. BUT THIS SEXY WEATHERSEALED BEAST IS COMING SOON
http://www.pentaxfor...d-20-40-wr.html
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