i love my n900 too and will never forget it.
but it isn't up to date any more there is better/faster and stronger hardware out there.
i will definetly buy the n9.
in my eyes the n9 is something like n900-2.
looks a little bit like it has a little bit maemo in it but will have(i hope so)
10 times better hardware specs.
but if you wan't a power user device which can do almost everything and doesn't cost too much then buy it