I was just wondering what other choral composers were using in terms of sample libraries or soundfonts. I'm in the market for something really top notch for getting mockups ready for contests or commissions. I've been using the soundfont that came with Finale, and it's served me pretty well, but there's a lot of things that it just can't do. The same goes for a lot of other basic soundfonts and samples - they're either too messy (really breathy or unclear) or unnaturally clean (like a really fake keyboard patch).
What do you use for composition and mockups?