I would suggest your luggage is more of a worry while stopping in cafe and such. I put all my wallet, phone, camera and stuff in a small magnetic tank bag and carry that everywhere you go. Most people think twice about messing with a bikers gear in broad daylight (bad boy image does work!) and like someone else mentioned nearly everyone is actually honest and not the dogs the media portray so your saddle bags will be OK. I actually need to get myself a small cable lock (there are compact retractable designs) that are perfect for tying your helmet to your bike and help give a little bit extra security.
Don't let fear of bad things stop you enjoying the good things
