You can look up the Stack and Reach Calculator, but its really a tool for fine tuning your fit at the front end once you know the ideal stack and reach.
I'd say the CC fit measurements give you a ball-park framework (e.g. the ETT you mentioned) from which to set the bike up to suit your proportions.
I found their Race/Eddy measurements are pretty much bang on what I ride now. The French option gave me a too long bike.

Your ideal stack really comes down to how flexible you are and how high or low at the front end you find comfortable. This can change with time on the bike.
Reach, to me, is the critical number.