Garmin = US company Tomtom = Netherlands Dutch company I prefer Garmin Nuvi, but that's just me. I find it more American friendly.
Buy one with European map already loaded, it will eliminate you from loading maps, run out of room maybe, buy an xd card... loan maps again. most best buys and American electronic stores won't carry a model with European map loaded. so you would most likely have to buy them from Amazon. ( I got mine from Amazon because their customer service just can't be beat, and if anything happen, they do refunds with no questions ask. So make sure it says "fulfilled by Amazon.") No need for high end GPS, something around $200 and below would do the job. you don't need an extra large screen, you don't need high resolutions, a widescreen format would do the job, you don't need life time support of traffic, those comes with advertisements, if you must, disable them. What you really need is lane indications, speech, and routing, meaning you can put in more than 1 destinations. I have a Garmin Nuvi 1370, best investment i ever made for my three times a year European trips. I believe the latest model is a Garmin Nuvi 2475. good luck hunting~