my old school had some guys i know come record the choir and orcestra, and one semester he ran i beleive it was AKG 460's front center, i think OTRF, i think the mics were set directly behind the conductor just over his head level, cause when he directs he's gotten the sound he wants from his point of veiw, you have to take that into account cause he might make violins play pianisimo , then cello's mezzo forte so they blend in the mix more. that is what i've seen.
and for the choir, he used 460s of the far left and right, and akg C414b's set up x/y center of choir, just above head level for the baritones in the back. other times he's ran the same for the choir, and some crown floor mics, and soloist were on wireless shure 58's i think so good luck, hope it works out, i'd love to hear it. i miss that stuff..
matt