Hi,
a few years ago I did my twin rating on a PA24 Twin Comanche. I did my IR in Bournemouth in a Dutchess. Out of the two I agree with Finals19 much prefer the Dutchess, It's a nice a/c, easy to handle. As far as training for the IR, it depends highly on the school and the instructor. My advice would be look at the school closer than looking at the a/c, it will be easy enough to develop the skills to pass the IR - what ever the aircraft - as long as you go to a school and have an instructor that suits you, and that's the best way to save £££
Good luck