I'm thinking of getting a Nuvi 200 from Garmin. Can I add a century route to it? Ar there (cheap) gps units that will let me?

If you're looking to ride with it I don't think it's the right choice. With a 5 hour battery life and rechargeable batteries it's unlikely a) it'll stay for 5 hours which means b) you won't see the end of your century unless you stop off and charge it or spend $$ on a second battery. That and Garmin's site says no to routes.

Check out the Vista HCx (http://bikeforums.net/showthread.php?t=378572). Little more expensive but is made for trails and navigation - even has a clip for the handlebars (extra). I spent a lot of time trying to figure out the best GPS for seeing where I've gone, where I want to go, routing directions, waterproof, and can take a hit with all the vibrations and a good amount of others have it too around here.

garmin edge 705

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garmin edge 705

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...which is twice the price.