The Versys is an excellent bike selection for your trip north. My wife road a Versys to Alaska in June/July 2010 and the bike performed excellent with zero problems. One of the best improvements is to put a 3 tooth smaller rear sprocket on the bike.
for the AK ride report we did for our friends and relatives. Other mods to the Versys are covered there as well.
Look forward to your ride report from Key West north. Ride safe.