Have you seen Mastercook?
It allows you to choose your measuring system and comes with a database of foods that you can edit or add to. You choose what format and size you want to print i.e. recipe cards. It does the nutritional calculations for you, and has lots of features like menu-planning and shopping list. I have never taken time to learn how to use the whole program, so I am probably missing out, but I do use it for recipe and nutritional counts every day.

I got my copy in a store, but here is the website http://www.mastercook.com/
At one time they had a downloadable trial version. I don't know if that is still true.

Hope this helps!
Sincerely
Kay