Okay. Thanks for the advice. I guess I could also upgrade the bike to a triple later on. However, the Silverstone is only $150 or so less than the Giant Defy 1 or WSD Avail 1, which has pretty similar components. So I'm not sure which bike to go with yet... but your info definitely helps!
I heard the alps are definitely harder than Tuscany to ride. It sounds like a lot of fun though! My husband and I want to do a tour of Tuscany, but I think it'll be a couple of years because of school right now.