My colleague and I had the otterbox for the N900, I really liked it...but...we both ditched it...b/c it wasn't airtight, at least not as airtight as the stock N9 case...mind you, I have to take my N9 out of its stock case once a month to clean it, but the otterbox...I was taking it out way too often b/c particles/debris was getting in...I ended up getting sick of taking that case apart all the time...over the years of multiple phones, I have found that the protector and a pouch are my way to keep it protected and clean of debris...but this isn't everyone's optimal way...

My advice to you is if you decide on otterbox or another case, it wouldn't be a bad idea to do the whole body wrap then, to protect the phone from scratches from the debris inside the actual case itself that gets collected over time. I wrapped a Sensation for my buddy, and then he put it in a case, which he never takes it out of...the other day, he took it out of the case in front of me, and wow...it was nasty...we both observed that without the wrap, the device would have been badly scratched up from all the crap from the case itself, in that way, I have found cases to be double edged swords if you want to keep your device in new condition. Since I use one myself, I do clean it though.

Since your new white N9 will have a more 'delicate' finish to my black one, the wrap itself will actually match the finish better as well, and make sure the finish doesn't get all scratched up from debris from the case or anything else. The white N9 is very very nice to look at.