I'm considering upgrading my wheelset to 2012 Mavic Ksyrium Elite wheelset that just came up on CL in my area. I'm an older rider, 70-100 mi. a week on an older (2001) LeMond Zurich with stock Aurora Matrix wheels. I'm running Ultegra 9 speed. Will the Mavic's work with a 9 speed? (hub is Shimano/Sram) Is the upgrade worth it for such an old bike? I typically ride rough roads, will these wheels be a harsh ride? Is $450 reasonable if they are indeed in excellent condition, very low miles as advertised? I'm 64, weigh 140, looking to do some centuries this summer. Thanks.