I owned a nokia n82 before the N900. The N82 is a fantastic and wonderfully flexible phone, even today IMO(with the right software). I was actually really looking forward to using it alongside the N900 to fill in the gaps, but the camera got a really bad bug all of a sudden. The camera itself became temperamental so it doesn't always activate regardless of the cover being open. Too bad.
N900 has kept me very content though.