N82 - I wasn't going to upgrade from my old K800i, which I really liked, but the lure of maps and sportstracker (both of which are really, really good, btw). The Wi-Fi connection is useful, and the bundled podcast application has turned me into a fan of all sorts of interesting programmes from all over the world. It has a decent radio and MP3 player (the things I really liked on the K800i).
The N series phones with GPS are a pretty good way to dip a toe into the water of GPS, and they're great devices in anycase (I'm pretty sure I've barely scratched the surface of what the S60 software is capable of). Anyone else on Sportstracker, btw?