If you are just starting out, why spend all the money on the Garmin 200? -

Disclaimer - I have a Garmin 800, which I use on my fancy weekend bike, and when touring. I also commute on another bike and have a utility bike. Both the commuter and the utility bikes have Planet Bike Protege 9.0s on them - nothing special about the PB Protege, there are a bunch of different computers which do the same basic thing as one another, but they cost ~$20 to $50, rather than the $150 that the Garmin will set you back.

You say that the 200 does what you want - what features are important to you in a bike computer?