Hey Fletch

You left out the TomTom ONE XL with the larger screen and the newer TA mapping software.
Also, the Maestro 4040 from Magellan which is best value for 4.3" display that offers TTS, TMC, BT, AAA Tourbook etc.
Last, Mio is the low price solution and al thought Magellan is saying MRM 2000 is almost EOL, the Mio C220 is just coming to market at a give away price of FREE with cell phone subscription. Uses iGO application and TA maps.
The Garmin 660 and 680 is best 4.3" screen if money is not a concern, but I think there you should have split them up to 3 categories.
Good = MRM 2000/2200T or Maestro 3100 or better yet the Maestro 3140, TomTom ONE or XL, Garmin Nuvi 350, Mio C220 all with 3.5" display at a sub $399 street price.
Better = Magellan Maestro 4040, Garmin Nuvi 650, TomTom ONE XL or TT 510
Best= Garmin Nuvi 660/680, Magellan Maestro 4050 VR, TomTom 910 with EU mapping software included along with the new LG LN 740 that you have rated impressive. All with over 4" display.
There are over 180 models and more is coming but for now, these are top picks that should be consider.