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tl;dr K5 or KS2 and 20-40 or 35 macro.
After using my K10D for more than two winters' time, using only a few FA zooms and M primes, I decided that I would get myself new DA lenses for it. Within a couple days, my center weighted meter and rear dial both go out. Okay, so it's time to get a new body, and probably just one lens to go with it.
DA 20-40 WR, or DA 35 macro.
Pentax K5 used, or Pentax KS2 new.
I would love the WR. It doesn't rain here often, but when it does, I always want to be out shooting in it. I could get the 100 macro WR in the future in addition to the 20-40, but the 35 knocks out two birds with one stone in a small attractively priced standard prime. It's also a lot sharper than the 20-40.
The KS2 has the front-facing screen that I'd use often, but the K5 has the top LCD and the grip option that I use every day on my K10D.