Classic or Flamenco? For what you are doing, I think the Classic is the sound. My personal favorite Classic models are Ramirez, Hirade and Guild. If you can find an old Guild Mark V then you might like it a lot. Hirades are readily available on the used market for reasonable prices.
The older Flamenco guitars had tuners similar to a violin in that pressure held the string in tune. These have now been replaced with tuners similar to those in Classic guitars.
An easy way to think of the differences to my mind are: Flamenco = gypsy; Classic = Segovia.
I think one of those old Guild Mark Vs might be the way to go. They are a little more lively in sound and are somewhat loud for a nylon string. You might check out a Tacoma. I have one of their steel strings. It's very loud. They do make a Classic model but I haven't played it. You get a lot of guitar for the price with a Tacoma.
From a FAQ at a dealer:
Q: What are the differences between classical and flamenco guitars?
A: The differences between classical and flamenco guitars are prevalent in materials, construction and sound.
Materials: Classical guitars are generally made with spruce or cedar tops and rosewood or mahogany backs and sides to enhance sustain. Flamenco guitars are generally made with spruce tops and cypress or sycamore for the backs and sides to enhance volume.
Construction: The body of classical guitars are generally deeper and the woods are slightly thicker. Flamenco guitars have a flat or negative (before string tension) neck relief, making the action very fast at the cost of some buzzing. The strings are also closer to the body on flamenco guitars to facilitate tapping. Flamenco guitars often bear a “golpeador”, which is a sheet of plastic mounted to the face of the guitar to protect its finish.
Sound: The classical guitar is designed to give the soloist the tools to perform poly-timbral music: “An orchestra in a box”. The attack is soft with a longer and gradual decay. The flamenco guitar is designed to cut through the sound of dancers stomping their feet. The sound is a bit more percussive, a loud sonic burst followed by a swift decay.
Steve
http://www.piemusic.com