Yesterday I found a left over 2006 for around 5k and planned to buy it today. I'm ok with steel the frame. However last night I was reading a tread which talked about the 07's having less vibration, engine breaking and are less prone to stall. I never spent any time on a 05/06 WR450. I do ride some slow rocky technical trails. If the vibration and stalling are notable then I would most likely get an 07. I would appreciate those whom have 05/06's to comment as to the vibration and stalling. I have been riding a XR 600 for some time. I have been accessing all the brands for a while have decided I getting a WR. Thanks for your help.