I went last year and used Garmin North America/Mexico DVD-2011 version for the map and that was very detailed for what were we using it for. We had a 60 CSX and a Montana and the detail was more than what we need. If you don't have the map yet, I would go with the DVD since then you can download it to any computer and I am not sure that it would work if you were just using the in the micro-SD file. Check with Garmin for compatiblilty.
What are you plans, needs and how detailed do you need your maps? I have some track let me know what you might need in a PM or email.
