consider buying used to see how you like the 450. It's not even in the same universe as what you are riding now. A 250 motocross bike may be worth looking at as well. Even that would be a very different bike and more fun than your current bikes. I know some guys prefer the smaller bikes for trail riding because they are lighter and easier to manuever.

If you ever happen to find yourself in Star Valley WY, you are welcome to jump on my bike and see what it is like.