Check out the Seco/Caboloy tools at
www.carboloy.com Good tools, good company with a good reputation and I know our sales rep will bend over backwards to help out.
They also offer
free software for threadmilling. I downloaded it a while back but haven't really got into using it yet but it looks pretty nice. It may help answer some of your questions and give you some cycle times ect. You can download a copy at
http://www.carboloy.com/wizard/default.htm