Not counting upgrading the quality of tyre on my bike (fair enough, the OEM's had worn out but I did want better rubber than those 020's), so far the crash knobs, tank protector & tail tidy have set me back around $400. If you count the better quality tyres make it $900 spent on my lovely.
Plans are to get a trick set of levers, braided lines & pipes. If I get them locally from a dealer (scary prices here in Australia), a pair of ASV's are $450-$500, and have been quoted $1,500 for Akra's!
Mite be time to use the old Visa on some US sites and purchase while the Aussie dollar is up over 80 cents.