I've gone thru several of the threads in this forum about GPS systems, and have pulled out a number of models. I've just priced them out. I'd like to buy a system for the car that we can throw in a carry on and use throughout the US and in Europe (and ideally New Zealand). I'd like to spend no more than $600 with full maps for Europe.

TomTom OneXL - $300 – wide screen version of One, 4.3” wide
TomTom Go 720 - $500
TomTom Go 910 - $450 – Europe maps are preloaded
TomTom Go 920 - $600 – preloaded with Europe

Magellan 4040 - $500, no Europe
Magellan 4050 - $600, no Europe

Garmin Nuvi 270 - $400 – preloaded with Europe
Garmin Nuvi 350 - $450 – no Europe
Garmin Nuvi 370 – $470 - preloaded with Europe
Garmin Street Pilot C550 - $450, must buy extra chip for Europe

Can you help me do a downselect? I'm clueless. The only thing that seems evident to me is that the Magellan systems are beyond my price point, since I'd have to buy European maps on top of their purchase.

Also, if I buy a Garmin without European maps, is this what I need to buy to get them?