Currently, I have an 06 YZ450. I want another bike to help absorb the hours and serve as a backup for racing next season. Would you buy a 2stroke or another 06 450. There are 06 450s showing up for ~$3500-$4500. 07s for $4500 up, in all brands. And 05 yz250 2ts for $2500 to the moon. Would it be good to try another brand for the different characteristics, like the better turning of the RMZ, etc.? I rode an 08 CRF450 the other day. That is why I'm thinking of other types/brands. I won't drop for another new bike. Variety or duplication???????