Zipp stem/bars experience?
 

I'm looking to get new bars and stem for my road bike, and I was looking for something super stiff. Weight is secondary to stiffness, but is also a factor. I'm a heavy sprinter type, if that makes any difference. Anyone use the 145 stem/SLC2 or B2 bar combo?

Also, if not, what stem/bar combos should I be looking at? Thanks!