This may seem heretical, but my opinion is that once you're beyond a certain basic level of competence in the operation and control of a bike improvements in that have very little marginal benefit.
Safety on the street is almost entirely a mental thing. Your anticipation, vision and the decisions you make are what determine if you live or die out there.
The real test of how good a rider you are (and by "good" I mean "safe") is in how often does an event surprise you? A car cutting you off, having to brake hard for a traffic tie up you didn't see until almost too late, a car you didn't notice pulling out of a parking lot in front of you, that sort of thing.
If it's more than once every couple of years you've got work to do.
My advice is to read David Hough's "Proficient Motorcycling". Great book.
'07 DL650, '01 DR-Z400S, '99 SV650 (race bike), '80 GS1000S, '85 RZ350, '08 Ducati 848