I use Bontrager Race X lites for racing. I got them new for $600 off ebay and they are grerat. Lighter then the Ksyriums and more durable in my opinion. I trained on them all summer as well. I weigh 172. You can get lighter wheels but will pay a lot more. If money is no object get some nice carbon wheels.

I just bought some Reynolds Alta Race/Aero Comp last week for $239 that I plan on using for crits next season. There is a thread on hear about them, a bunch of people recently bought them.