i did the exact same thing as you - i had an e900 back - the touch buttons were a pain so had the d900 back instead - which is very good - really nice looking - slim - lovely - there's just two things i would say (after upgrading from the d500) - when its closed there isn't a clock on the screen just a blank screen (looks like its off) and when sending a message you have to scroll down to send a save otherwise it will just send - i know these are very minor and to a personal taste - but other than that i'd go for the d900 - i'm very happy with it!!