Two of the weakest and most overlooked aspects of these Bonneville's are the suspension and brakes. Changing the front rotor to an EBC floating rotor will help, as well as upgrading to their brake pads. For most riders, upgrading the rear shocks to ones that are non-reservoir rebound adjustable is a good way to go. The front fork suspension is a bit trickier. On the inexpensive side you can swap out the stock springs for progressive ones (Hagon makes a good set), or go all the way and install a double-action valve with new springs and adjustments to match your weight and riding style. Some have gone even further and had adjustable cartridges installed inside the fork tubes. You don't appreciate these modifications until you've become an experienced rider and have tested the limits of your bike in a wide variety of conditions. For this purpose, I also highly recommend professional ride training classes and/or track days for the purpose of enhancing your skills, and knowledge of your bike and how you/it interact.