In 2003, I visited a good number of flamenco luthiers. By far the most responsive instruments I played there were those of Pedro Maldonado in Torremolinos: they vibrated against my chest as if live, and the tone/sustain was excellent. Since that experience, I miss the "live" feel. And I have a 1973 Gerundino, 1969 Arcangel Fernandez/Barbero (hijo), and 1941 Ramirez in my collection.

Watch out for Gerundino fakes. He was a friend of mine, and the last guitar he made was a black famenco in 1976. He stopped making guitars after his beloved wife passed away.

I would recommend a 65 cm scale for a low tension instrument or 65.5 cm for the standard. Make sure the grain in the tapa is narrow in the middle an and perpendicular in the cross section that matures best (visible at soundhole).