Yes, you should get the N9 as it is the closest experience you'll ever get to your N900. Forget about closed os like ios and WP7.5, you will run screaming back to your N900. As for Android you will not be happy with no terminal mode, no positive way to close an app and flaky multitasking. So get an N9 because it's the only chance you have to continue your N900 experience or most of it.