It all depends what type of riding you will be doing, and how much you are carrying. So will you be self contained carrying all of you gear and camping each night, or do you plan to stay at hotels?
If there are two of you, are you both buying bikes specifically for the trip?
Other things you want to look into are racks for carrying equipment on the bike, panniers, and possibly different handlebars on the Dawes if you are planning on riding long days so that you can get more hand positions.