A few tips for recording horns (besides the general consensus that, yes, ribbons are wonderful if you have them):
Saxes should not be mic'ed at the bell, but rather the mic should be parallel to the body of the mic, aimed to pick up the whole instrument. The exception is sometimes I'll use a second mic at the bell of the soprano and blend it in to be able to adjust the reedy/honky amount of the tone. Also, on R&B baritone, where the sax is pounding out bass notes, I may shove a dynamic right into the bell as well.
Trumpets and trombones are mic'ed at the bell, but often off-axis to be out of the direct path of the air-stream.
Don't worry about isolation if you are recording horn sections. Let them bleed!
Flutes should also be mic'ed to get the whole instrument. You may need to adjust the mic position to point a bit away from the mouthpiece to minimize embouchure noise.