I'm glad you made a choice you're happy with!
I find the main problem with IUD is that so few doctors are trained putting them on. The one I got is specifically meant for women who have never had children so it's smaller, but I had to research it myself and be the one to tell my gynecologist what to order, because she had no clue that even existed. Not too reassuring... fortunately she still inserted it fine :P
I hope the diaphragm works for you, let us know once you get it!