I have an 08 Trek FuelEX 5.5 that I am upgrading most components on. The BB5 brakes on there now feel very weak and I get brake fade on longer downhill areas. I want to upgrade to hydraulic brakes and eliminate as much weight as possible. are the Avid Ultimates the way to go. do I need to keep the 185mm / 160mm setup I have now? are there other good, light, and less expensive options?

Thanks!