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I will vouch for P90X (and <1300 calories a day).  I'm down 80 lbs from last April and can do more pull ups than I could in College.  It is a good program.

A belated well done PJ 8-)
Losing weight is never easy, sticking to a restricted calorie diet and exercise program is harder still.

The best workout program is the one you'll do on a regular basis and that offers high rewards with minimal risks. It can be as aggressive as the P90X program, Kettle-bells which I like, or just a simple daily walk with maybe a little upper body calisthenics thrown in.

A lower body weight even with minimal exercise will be noticeable.
Carrying around all that extra weight is a workout in itself. 80lbs is the equivalent of OS's food pack minus pack extenders or so I'm told :'( ;D