User reviews for both lenses can be found here:
18-55 WR:
http://www.pentaxforums.com/lensrev...6-WR-Weather-Resistant-Version-Zoom-Lens.html
18-135 WR:
http://www.pentaxforums.com/lensrev...3.5-5.6-ED-AL-IF-DC-WR.html&page=2#reviewlist
In general the 18-135 is favoured, but this may be biased by the price difference
The 18-135 would be a lot more versatile without needing to change lenses, it's probably not quite long enough for wild animals and birds unless you can get very close, but will have quite a bit more reach than the 18-55 WR.
Another good option for landscapes is the DA 16-45mm f/4.0, a step up from the 18-55 kit lens and arguably Pentax's best value zoom lens (~$250 used).
Please note that there is no DA 55-200 - it's either the DA 50-200 (Non-WR and WR versions) or DA 55-300 (the 55-300 is sharper).
18-55 WR:
http://www.pentaxforums.com/lensrev...6-WR-Weather-Resistant-Version-Zoom-Lens.html
18-135 WR:
http://www.pentaxforums.com/lensrev...3.5-5.6-ED-AL-IF-DC-WR.html&page=2#reviewlist
In general the 18-135 is favoured, but this may be biased by the price difference
The 18-135 would be a lot more versatile without needing to change lenses, it's probably not quite long enough for wild animals and birds unless you can get very close, but will have quite a bit more reach than the 18-55 WR.
Another good option for landscapes is the DA 16-45mm f/4.0, a step up from the 18-55 kit lens and arguably Pentax's best value zoom lens (~$250 used).
Please note that there is no DA 55-200 - it's either the DA 50-200 (Non-WR and WR versions) or DA 55-300 (the 55-300 is sharper).