N810 forever! (The N800 is SO ugly I just couldn't stand it).
+: Keyboard, Display, Form factor, Video (using MPlayer)
-: GPS (software problem), no FM radio, miniSD (instead of dual microSDHC :-)

Un-Fortunately, I've also got an N82 which is in many areas much more advanced than the N810: a perfect GPS, great uPnp AV functionality, PIM, HSDPA, GMail client, Nokia Sportstracker, FM radio... The two complement each other quite nicely!