Great goal, and I wish you luck.
I recently did the Dukan diet. I dropped from 220lbs to my current 150lbs in 4 months. Its quite a tough diet, but i was never hungry and seeing the daily drop in weight helped me keep my motivation (i have a short attention span and like instant rewards!)
The diet is restrictive, but the old adage of getting out what you put in works.
I have to say im happier with myself and feel so much better for the weight loss. I didn't realize how the weight was affecting me.
Again, good luck and I really hope you succeed