I am fortunate to have owned numerous bikes over the years. I enjoy taking a new project then making if fit me.
Over the past few years I have learned the difference between stock (terrible) suspension, upgrades, and "individualized" suspension which is sprung to my weight and riding style. I love to ride Hill Country twistees.
For performace, I get rid of the cat and do stage one upgrades (with a tune) immediately. However, I now spend the next increment of cash on suspension rather than stage two performance. Stage two will be done eventually, but as I have learned more about fine tuning suspension, it has take priority.
There is a small persentage of the time I spend riding that I'll notice the difference between 90 HP and 105 HP (and torque equivalents). However, in almost all riding situations I appreciate predictable throttle response, less engine heat, and upgraded suspension.
This is a long-winded way of suggesting you read the supsension refeences carefully and then set up the bike for how and where you want to ride it.