looking for your opinions. Been riding mostly trail for 10 years and am looking to get a motocross bike for motocross. I am 6'1, 205 pounds. I'm on a 2006 wr450 and plan on keeping it for trail riding(green sticker) but would like a motocross bike for the track. Any opinions, 250f, 450f, 250f, 450f. My brother recomneded the 250f. Thanks in advance for your opinions.