I'm mostly a dune rider. I've been riding CR500s for 10 years. Question is: is it time to sell the 500 and go to the new CRF450 or WR426? With all the green sticker/red sticker and dune closures I'm thinking I could street legalize a 4-stroke, legally ride in many parts of the desert, yet still slap the paddle on when heading to the dunes. I'm not sure they make a better dune bike than a CR500, but I'm feeling limited on riding opportunities. I think a street-legalized CRF450 or WR/YZ426 would be far more versatile. Do these bikes have enough wallop and are they light enough to maintain the 500's fun factor in the dunes?