Hi madmax,
I just bought a G a few weeks ago and was looking for one for a while (was very fussy with what exactly I wanted and over here in Germany there doesn't seem to be as many!)
Even though I got a bit desperate in finding a G I wanted, I ended up passing on the ones which didn't have the punctual service history, and also the multi-owner cars, mainly due to the feedback I got about the Multiair units being "fussy", and also finding te 2 year interval a bit long.
With the G I bought, I called the two different garages where it was serviced, and got a full list of what had been done, including which oil; and got the AR dealer I bought it from to do a service and cambelt change, with it all documented.
If you're the type of person who would service it every year and do it right, I'd wait for one that has already been serviced at least to "specified" standard, and wait it out.
Hope that makes sense!
Ben