I would actually use the Sram cassette.... Lighter and cheaper than ultegra... I think its the pg 990 or something, their top of the line model. Sram chain too. The brifters definitely duraace, the rest doesn't really matter at all. I would get ultegra cranks and derailleurs and use the leftover cash to get some ZG brakes.... Duraace cranks are way overpriced for the performance difference.