I would definitely consider the IUD. I have one since June 2006 and it is wonderful for me. The only few drawbacks I experience are spotting in between periods, and the cramps have become more intense than they used to be, plus a heavier period that lasts longer. I noticed I start spotting about 3-5 days before I am actually due.
It did take some getting used to at first, as your body has to adjust, and I bled 2 weeks out of the month for the first two months.
If you research it, you will see that is normal.
The one I have is non hormone, and you keep it in for 5 years.
My sister does the Depo shot, and she has gained weight on it. You also do not menstruate when you are on the shot, so I don't know how healthy that is to go years without a period. But that's just me. =0)
I would NOT recommend the NUVA Ring... I know 3 women personally that it made so depressed, they were suicidal, including me! I have heard other horror stories concerning it causing severe depression when women have used it. I barely made it a month and I was ready to be admitted into a hospital, I was so depressed and non functional. After doing research and women telling me their stories, I removed it and was feeling better in a week, though it has done permanent damage as I am still not completely the same.
Hope the info helps!!