I don't want to poach woolfs thread, but I can answer some questions. Your looking at around five hundred (USD) to have them install the components in the fork, $135 is labor. I am competent mechanically, but they really know what they need to do and they even honed the fork tubes. The shock is $1300 and you must get the remote reservoir (included) if you have ABS.
Here is what I think of the upgrade:
http://www.cbr250.net/forum/cbr250-performance/2450-race-tech-suspension-review.html
I absolutely love the upgrade and consider it criminal to let any rider, especially a new rider, leave the store on a bike that isn't sprung for them. If you ever wonder how a motorcycle is supposed to handle, get a properly setup suspension. I weigh 255 pounds so this was a necessary upgrade for safety. Lighter riders may be ok with the stock suspension.
The only problem is now I have to buy a Race Tech suspension for my next MC. I don't think I will be able to tolerate poor suspension again.