Mike Miller (controvertial BMW tech guru) says that 7000 miles on summer tires is not unheard of. But that's probably on the heavier weight 540.
Not sure about differences between m-sport and sport package. Anyway, looks like you've tapped into one of my main sources - bimmerforums.com
I've also got the August 05 Bimmer magazine open in my lap. There's a great e39 buyers guide. I'd be happy to scan the article for you, but I won't be back in the office until Friday.