I`d suggest you do a google search on "Lehmann`s service reviews" and see what you get. A quick one I did showed a mixture of good and bad with revisions to estimates and delays getting parts but others praising them. They are accredited service agents so should be OK - whether they are cheapest for repairs might be another matter. That said if they are local to you and you can take it into the shop for discussion re: faults it might be worth the extra. Re: delays this is probably standard - if you send it off to Nikon for an authorised repair it will take some weeks so don`t think it will be an overnight job.
Re: shutter life on a D80 Nikon say it should last 50,000 activations. You see a lot of threads on Flickr and the like worrying about shutter activations but this is really a finger in the air conservative estimate I`d say. I`ve heard of sme D80`s going within the first 20,000 activations - though I`m sure those people got the problem resolved through Nikon if they had any sense- but man more going beyond 50,000. My onw D80 now relegated to back up body has done around 55,000 with no problems arising yet even after a 6 ft drop on to concrete in it`s last week of regular use (hey you have to justify buying the D700 somehow

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To check activation numbers if you are on flickr you can just upload a straight from the camera jpeg image and you can see the activations in the exif data which is under Actions, View exif data when you click on the image. You can set up a free account on flickr if you want or there are other ways of checking activations but I forget as I have never needed them.The D80 is a great camera - yes it`s dynamic range is more limited than newer cameras and it`s low light capabilities are not as good as higher end models but it`s a geat camera to start out on if it works out cost wise for you.