I'm currently looking debating weather to get either of the above bikes. I can get a 2002 CR500 or a bit cheaper a 2002 426. The bike would only be used for sand dune riding with a paddle tyre. I currently ride a '98 YZ250 up the dunes and its great fun but I thrash the living hell out of it keeping up with mates banshees etc. I would really like to get another blue bike in the shed but would the 426 have the power the old CR500 has? I've seen the CR500's up the beach and they really haul ass. I have never ridden a 426 or 450 and but own a WR250F for bush work which I really enjoy for that purpose.