Go with the Garmin Topo Canada, excellent for back country stuff. It get's loaded into Mapsource or you can buy the pre-installed SD cards.
http://www.gpscentral.ca/accessories...topocanada.htm
http://www.gpscentral.ca/accessories...crosdcards.htm
Wait, are you upgrading the gps or the software? I'm a bit confused by SOTF's post now.