It seems that Garmin is offering $50.00 rebates until the end of the year on certain models of GPS.. I was looking at the vista CX. Can anyone give me any insight as to if this unit will fullfill my cylcling needs and if any addl. accessories or software is needed to make it work the way I want it. Cheapest price I've seen is $278.50 less the rebate. Seems very reasonable. Any help would be appreciated. I've never owned a GPS before.