I still use my N8 for quick pics. Be ready to be a bit disappointed by N9's camera. Although, you'd love it for the speed.

Harmattan = pure win. If you love tweaking around and being the controller of the phone, you'll enjoy it.

but everyone already told you that.. I'm just confirming it

FasterN9 and N9QuickTweak should be the two first applications you wanna look for to get started. Then of course comes Wazapp.. Our own lovely WhatsApp soup xD

aaaand.. The conceited but helpful community is always here to help!