Hey, there!
We're doing exactly the same thing right now. We've looked at Sigmanest, FastNEST, and... a few more that I can't recall. Our major problem has been the fact the we cut either large quantities of identical parts, or "kits", ten to twenty parts that need to stay grouped. Most nesting software out there (that we've seen) prioritizes parts largest to smallest, regardless of the individual priorities you've set for the piece.
If you get any good info, or find one that's good, let me know.
blittle@litnc.com
Thanks!