InCopy vs. Indesign

I am currently considering whether to purchase the Indesign program or merely "settle" with the InCopy version.

Might anyone give some input as regards to when it would be beneficial to choose IC i/o ID?

Could I change pictures, text and to some extent layout in IC if I have some templates created in ID?

Hope you can help me out!

Thanks & brgds

Betinna Holm