I have a d90 and am totally happy with it! There are so many reviews out there comparing the two, just do a quick google search and you will find plenty.
From what i read The d90 and d300 share the same sensor so images are comparable in certain conditions.
The d300 has a metal body and weather sealing which helps against dust and water.
Shoot with higher iso's with less noise....( the d90 is still pretty competant here though)
There are other differenses....as i say read some reviews mate!
Not sure the 18-200 will be to good for landscapes at the 18 end as I believe they suffer from barrel distortion.
hope this helps.
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