DVD to lose weight? recommendations please?

Hey guys,

I am looking to go down a dress size and have been looking into DVDs as I am stuck for time at the moment to get to the gym. I hear mixed things about Jillians DVDs, P90x and Insanity are quite expensive. Any recommendations? What are your experiences with these?

Bear in mind I am not overweight, I know sometimes it can be easier to lose the weight if you have alot to lose so it might be harder for me. I need something that works!