Sharpend offers some excellent advice. I owned a Cirrus SR22 for four years. There have been numerous prop strikes in Cirrus aircraft, and I can confirm they are susceptible to bouncing if landing fast. If you know this is a risk and get some good instruction this should not be a problem.
I also had a door pop open in flight on a number of occassions before I learnt how to properly check it was closed. This is not difficult to learn.
The amount of time you need to convert will depend more on the avionics than anything else. It is important to stay ahead of the plane and the more familiar you are with the avionics the safer you will be in my opinion.
I have fond memories of my Cirrus and would go back to it if my mission profile suited.
3VE