I think that n9 is the best choice for you...
After having a n8 and after this a n900 for a while I think that maemo is better than symbian... but, n900 is an "old" phone and has not the camera that n9 has....
So I think that n9 is faster and better for daily use and for programming if you are interested!
(I don't have a n9 but I love this phone )
From the other hand 808 is the phone with the best camera out there, I think... But with symbian, this phone has no future and we all know it!