Hi John, no not just the 18-55 & 50-200 WR's, for higher quality water and dust resistant lenses have a look at the Pentax DA* range which includes primes and zooms. Some examples from a DA* 16-50 are pictured above.

So Why did you choose Pentax and are you still happy with your decision?

Jumped ship from Olympus getting on for a year ago. Came to Pentax firstly because the Oly body I was hoping for didn't materialise (I was hoping for a weather sealed E-30). My other motivation was that prior to deciding on Olympus I had seriously considered Pentax when I moved from a Fuji bridge camera. At that time it was between the Oly E-510 and K10D but I opted for the Oly based on features and handling although it was a very close thing.
When I changed brands Pentax (with K20D) offered the best overall package based on cost, image quality and durability (weather and dust resistance). I then began to appreciate the handling and quality of build the more I used the K20D. Now with the K-7 I'm even happier as it's closer to the compact build handling that I appreciated with Oly whilst retaining and enhancing all the traditional Pentax virtues. So yes I am still happy but that happiness is slightly tainted with the recent increase in Pentax lens prices.

How does the Pentax equivalent compare to other brands you have experience of?

In my experience it compares very well with Olympus. Both systems have their strengths and weaknesses to greater or lesser degree. The only area where I would say Olympus has a consistent advantage over Pentax is the optical quality of their zooms (particularly their Pro range) and in this area I believe they also out perform all the other mainstream brands too.
Equally I think Pentax tower above all others with their primes. For per pixel sharpness, image quality, high ISO performance, VF, build and handling Pentax gets the nod too. An area where Pentax still slightly lags behind is focus speed, even compared to my old E-510 paired to the excellent Oly Zuiko Pro zooms with SWD motors. Still I can live with that because all the benefits the Pentax package offers me outweighs these negatives.
You can probably tell however that I still harbour a soft spot for Olympus

Yes it does look a bit busy there I agree, does depend on focal length and how closeness and type background. Here is the 100% crop of the bottom left corner...

[IMG]http://img26.imageshack.us/img26/7218/imgp4525100percentcrop.jpg[/IMG]

I actually find it quite refreshing change from 16mm (DA* 16-50).

Stitching images together is also a possibility to consider for landscapes.

Yes limited are costly, I nearly ordered a DA 35 Macro when they were around £280 before the price rise but hesitated

Expensive yes, but it does resolve amazing levels of detail for a zoom at the right aperture.

Here are a couple of f/2.8 examples for you taken at the weekend..
Note the first one could have done with around f/4

[IMG]http://img23.imageshack.us/img23/6629/imgp4542g.jpg[/IMG]

[IMG]http://img23.imageshack.us/img23/1570/imgp4525.jpg[/IMG]

All I can say is that I like it and I wouldn't sell it in a hurry but it's not as good as my old ED 12-60 SWD

Looks pretty good Rob, what do you think about the field of view? As Stefan mentioned there is the DA15 Limited but at a price....

As Stefan says the "high quality 16-45 WR" would be the DA* 16-50 f/2.8 quite a different animal to the 18-55.
Much more costly but built like a tank (also not exactly compact). However in the f/5.6 to f/11 (approximate) sweet spot the resolution achievable is very good indeed. f/2.8 is usable too but soft at the edges, fine for it's likely use at that aperture.

In conclusion a very nice lens but not the best wide angle to short telephoto zoom on the market

Welcome to the forum John

What problems are you having with the WR? Is it the 18-55 or 50-200? If it's the 18-55, in my experience it does need stopping down for best performance. Even so it can be a little soft at the edges. Factoring in the cost, it's not bad but not great either. See here for a recent discussion on the merits of Pentax kit lenses (and others).

Just goes to show how close the competition is in this bracket. The K-7 is a strong competitor.
Btw I always shoot RAW with mine and actually I did with my K20D too. I prefer the level of control it affords and actually when the image is pretty close (which is most of the time) then RAW processing is pretty quick

No not at all, I've only had it happen once when I was doing a marathon test to see if mine had the 'greenline' issue. This was also when we were had quite hot weather.
Just to add I also used it for the odd clip in Provence this August and that was seriously hot but no over heating.