That's good news and I'm glad you have because from personal experience that is the sort of discount that is necessary to ensure your not going to dissapointed with depreciation come resale time.
Carl, do you mind me asking which dealer you use ? Were they very forthcoming or did that discount take a lot of effort ? I'm waiting for a quote from my dealer but I don't think he's going to get anywhere near that. Cheers.
Maybe check with the dealer carl, on the e46 M3 NAV has no fin, only telephone equipped cars - I dont know about the z4, but if you really don't want a fin I'd check