If you already haven't done so, look at
PENTAX : Welcome to the PENTAX Photo Gallery and, to a lesser extent,
Pentax Cameras with Photo Samples and
Pentax Lenses on Pixel-Peeper . You may also want to see the reviews on
http://www.photozone.de/pentax/ . Then you can get a good idea what you like. The DA17-70 is good too - I had one until I got a significant number of other lenses (mostly primes) that covered the same territory. I (and most people on this forum, apparently) definitely think the DAL55-300 is better than the DAL50-200, so if you're not going for the DA18-135 or DA*50-135 (or something similar) at least go for that.
I should add that, since you haven't bought the camera yet, I believe you're much better off investing in lenses than a camera body. Lenses contribute more to the image quality, and they mostly hold their value (and sometimes increase in value). Camera bodies depreciate and usually get updated in 2 years or less. I didn't bother upgrading from my K-x to a K-5 until I'd spent many times the cost of my body on lenses. And when I did upgrade I didn't notice much difference, because the quality was in the lenses. If you don't believe me, compare the cameras' studio shots on DPReview.
If you don't mind ordering overseas, right now Adorama has a great deal on the K-r
with the nice DA35/2.4 lens (worth around $200 by itself) for $630. If you use the links on this site you can get free site supporter status on these forums as well. Then buy yourself the DA*50-135 (which is WR) with the money you save - either new or used, as you wish. Don't worry about the camera getting a little wet unless you're dipping it in water (which I wouldn't do anyway) or are really in a heavy rainstorm. The early winter rains certainly didn't hurt my non-WR Pentax body when I was in Brisbane and Noosa a few years ago. Then you can easily pick up a 18-55 lens (WR if you like, but at that price I wouldn't worry about the lens getting damaged), or any of a number of Pentax/Sigma/Tamron lenses in the same range. With the K-r and DA*50-135 you'll get better image quality than most people who spend over twice as much with other brands.
While it's true the K-r is likely to be updated before the end of the year, so is the K-5, and at this low a price the K-r can't depreciate much.