I have 3 rides on my (new to me) 2005 WR450F and I must say I love the bike and this forum has been a great help so far. I am a rider in my 40's that has some lower spine arthritis and the typical ailments of an ex football player. I know the bike is set up stock for a 160 to 180lb rider. We'll I'm 6'3" and 250 to 265 depending on the time of year. I have read the forums on different suspension vendors but I need to know is there a difference between a $700 re-spring and re-valve and an $1100 one. I typically ride SoCal desert and trails. What is typical cost and who did yours?