I agree with Ben (as usual), especially about keeping micpres close to the mics. Cable capcitance becomes a siginificant issue with ribbons, unless you want the top end to REALLY rolloff. I have an SF-12, and for some things (choral, solo voice, certain early instruments, brass touchup) the smoothness is wonderful. For other things, I miss the transient response.
The best thing about the SF12 (and likely the SF24 also) is he lack of crunchiness on choral groups.
Make sure that your micpre is the appropriate input impedance and will give a clean, quiet 55-60 dB of gain. Also, Blumlein often gives too side a stereo spread, so you'll want an M-S option, or the ability to fold in the image a littel in your DAW.