I have a 1998 CR 250 that beats me to death ! I enjoy riding trails more than MX. I have rode my buddies WR 250F and really love it & think I need a 4 stroke. I am so use to the power of the CR 250, will I be happy with the power with the WR 400? I do not know much about the 400 are they good reliable bikes? I found one for $3800.00 ... any opinions????