Navigon with iphone right now.
Used to have Garmin Streetpilot 2610. No 3d maps, but much more you could do to customize it with settings and info. I liked it.
Garmin Nuvi. Forget which but they all seem the same these days. More simplified than past. Just don't like anymore because POI's are a pain. I need Google search. That system in the past of updating maps for 70 or so each year is dead to me now. And i don't get the needless features of photos, bluetooth, and music.
Haven't had one built in car yet. Probably wouldn't. I'd prefer my next car to be fully integrated with smartphone. I just dock it easily or take it with me.