I would fully recommend a stock Chinese frame from a company like Dengfu or Yoeleo. The quality and ride will be equivalent to a second tier frame from the big brands, but less than 50% of the cost.
I also fully endorse Yoeleo wheels, they are not cheap, but they use top spec DT Swiss hubs and are pretty close to Roval / Zipp / DT swiss, but cost 40% less.