Switchback Adventure or Ski Doo Blizzard?

Hi,
Getting back into sledding after a 30 year hiatus. I don't need to have a BEAST motor, just something that's fun and handles well. Test rode the Yamaha Sidewinder, and found that it's just too potent of an engine, and the throttle seemed too responsive. So I'm looking at a 600 etec Ski Doo Blizzard and a Polaris Switchback Adventure or Pro S. My main concerns:
1) I want excellent handling
2) I want excellent suspension to preserve my back (I have back issues)
3) I want good fit and finish
4) I want a reliable motor


What works best?
Thanks,
J

Thanks! I can't test ride every sled out there, and these are things that I need to know! Much appreciated.
J