Between Magellan and Garmin go Garmin, I work part time at an outdoor store (mostly for the discount and I get to teach kayak lessons all summer on the ocean) and we sell hand helds as well as auto units. Our experience with Magellans tech support is the least desired of the two.
The Nuvi series is selling like mad, if you want to use this thing in Canada the 200 does not unclude it. The Nuvi three series and up talks the street you are turning onto, the 200 (unsure of the 250 and 250W) just tell you that you have to turn but the street is printed at the top of the screen. The new Maestro 4250 from Magellan is voice activated, haven't heard any feed back yet...
My advice is to decide how much you want to spend then look acroos the board. Pay attention to where you buy and what the gaurantee is, most of the manufacturers warranty for two years, some retailers offer a satisfaction guarantee.
I could go on and on but one last thing, if the price is low make sure it's not refurbed and make sure it has enough memory to downlaod future map updates.