I will finish out the season with my 250 and then next year I upgrade. I am thinking in advance as to what bike I like. Here are some of my thoughts. 2009 Yamaha yzf r6 2006 Kawaski Ninja zx6r 636 2007 Honda cbr 600rr Or a 2004 Yamaha r6 Any thoughts as to which 600 I should buy?