Fantasminha, Looking at Mapquest it looks like the trip is roughly 125 to 150 miles, that's an easy ~50 mi. per day, a slightly less easy 75 mi. per day tour. Even though the trip duration isn't that long, I'd opt for the low riders and be ready for something longer in the future.
While I'm still building my first drop bar tourer, my experiance comes from trying to load up a motorcycle with few and too small anyway luggage options...it's better to have an abundance of storage area, rather than too little.
Brad