Go for the Viper. I just picked up a 04 RX1m 153" for my son & rode it for 1st time this wkend . 4stroke has lots of power for sure , but its just a different machine as to how power comes on , if that makes any scense?
I prefer My Viper .Picked it up last yr , low miles as well & my 1st sled ever so WTF do I know?