Dave,
Actually, OnTarget2 is a great program and it's pretty easy to use. You can get a FREE DOWNLOAD to use for 2 weeks from www.pinwheelsoftware.com and toy with it to see if you like it, before you have to buy it. Check it out, it's a pretty cool program for drawing trajectories, spining arrows, and such. Well worth the $20 I spent for my own personal uses alone.