Welcome.
You appear to know what you want to do with the new bike and have researched some nice frame sets that would meet your needs.
What is your budget?
You said $2000 is too much. Is $1500 in your range? $500 to $600 for the frame and $800 to $900 for mid-level new components.
Complete bikes (new) can be a better deal than building your own. Or, buying a Craigslist bike and then modifying it can be a much better bargain because bikes depreciate dramatically.