I owned 3 banshees in all and none can compare to the holeshot I get on the 450.I loved the power delivery of my banshees and the plush seat,but that was it.Even with suspension work,and the best tires,handling was marginal and ergonomics sucked.
450's are hard to beat if you set them up right.Watch the weight you add in aftermarket,including tires,A-arms,axles,pipe etc.Ditch the electric start for Kicker,remove the extra starter junk from flywheel and viola!Its hard to make up the power potential compared to a banshee engine,but these things will fly if you can shave some weight.