I started this thread in the Tech Log forum some time back, regarding the spin characteristics of the Cirrus SR20 & 22.
Cirrus SR20/22 - Was this a bad idea?
Not too much attention was give to the thread at the time. It has a number of good links to information explaining exactly why the Sirrus, and other new aircraft, have the particular spin characteristics that they have.
I was looking at this information because I was interested in an SR20 at the time.