Be careful Serge...Flamenco has lured many
I know several well known classical guitar builders who now make almost exclusively flamenco guitars (Les Stansell, Lester Devoe, Eugene Clark) as they find the musical form so engaging and in general Flamenco players are more fun than classical players who are much more conservative, especially in what they expect a guitar to look like.
One thing to note is that historically there was no distinction between a classical guitar and a flamenco guitar. It is much more than just blanca (Cypress or Mapple) or Negra (Rosewood). In Torres day he built very successful instruments from very humble woods to very nice pieces of wood.
In Spain, Cypress trees grew like weeds and therefore was the cheapest most plentiful material to build a less expensive guitar that still sounded good. Because the people in the south who were Sephardic jews, Moors, Greeks (El Greco was a Greek) and Romish Gypsies, they were much poorer and therefore played less expensive Cypress guitars which today we would identify with Flamenco.
What has changed in guitar construction that has lead to todays Flamenco guitar has been the virtuosity of famous guitar players such as Carlos Montoya, Nino Richardo, Sabicas and Paco De Lucia that has changed the flamenco guitar from an accompanying instrument into a solo instrument.
This caused luthiers to build for quick attack with less sustain (achieved in part by making the body more shallow), with more volume up front (by lighter and less bracing) and much lower action (string buzz is tolerated if needed to get the action faster). This evolution has resulted in an instrument that is different than a classical guitar.
"Negra" guitars are Rosewood guitars that are built to flamenco dimensions and voicing but for players that want the tonal color with which a classical rosewood guitar is associated.
Personally Flamenco can be appreciated recorded but it is when you hear and experience it live that you get the full effect and understand why it is so enticing. Colin was correct in that alot of the flamenco heard today is either "nuevo flamenco" which is not really Flamenco as it is like calling easy listening music Jazz...cant touch the real thing.
Also at a number of restaurants tourist traps (even in Spain) you will see what is put out as Flamenco which is usually alot of strumming and heel stomping dancing...this is not the pure Flamenco and a pale imitation at that.
If you get a chance to hear real Flamenco in person you will be amazed...