I am yet to get the belkin tunedock but I have seen pics and it seems to fit nicely. The iTrip is ok but i get alot of interference so am getting the aux installed. The belkin travel charger is great as it has a built in amplifier.
if you use the correct base unit for the tunedok and set the angle of the iPOD correctly it will fit in under the toggle switches just about. i used to use a belkin autocharger with it too. however i found that it was a very tight fit when using the iTRIP, so i ended up just placing it in a cup holder without the tunedok. i found that the ITRIP worked fine in rural areas but not in the town and cities i was for every having to switch channels.
get a dension its much better kit, sound and placement of the unit. i switched from my setup to this and its the best cash ive spent since buy the iPOD!