I like Wild Ginger. The program for blokes, Tailor Made, has some good stuff in it, and you can personalize it easily. Take a look: http://www.wildginger.com/

Download the free demo version and play with it. You can't save patterns or print from the demo, but it'll give you a good idea of whether you like it or not.

All pattern drafting software is easier to steer if you have some drafting experience.