i'd for n900 or n9
why?
linux and open source
n9 will feature meego and n900 is maemo
usually at stock, all *ALL* nokia phones are fast, later.. they slow up as more apps/widgets are added
linux can overclock
symbian is kinda limited in that matter
but since ure a multimedia guy, wait for n9..
its a mixture of both..
im doing the same
plus, you get ur beloved keyboard too