GPS with canada maps also good for bicycling?

I'm looking for a portable GPS that I can use for driving in the US and Canada and can mount on my bicycle for road trips. I think the garmin nuvi 500 is good, but no Canada maps. Any advice?
Update: I think the garmin nuvi 550 will do the trick! I don't care so much about elevation, but at least this one has CA maps.
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