Try doing your training in a R44, lots of autorotation capability, the R44 is really easy to maintain NR. Even Frank Robinson is trying to convince schools to use an R44 rather then R22 as basic trainer. As for reliability for engines, piston versus turbine; lots of the data for the reliability of pistons is from the 50s and 60s, be careful of statistics.
I work for a company with 50 helis, R22 to B212 (25 piston, 25 turbine) and in the last 5 years all our accidents (none were fatal) have been pilot error not mechanical failure. I joined this company with a hatred for pistons and have become a bit of a convert to the modern piston helicopter (R44 not R22).
Good luck with your training where ever you go.