i am partial to stott's for technical form and learning but she as an instructor is kind of boring. i also like ana caban,mari winsor, and karen voight.
There are lots of reviews of Pilates DVDs over at Video Fitness which might be helpful to you. Here's a link to that page. I tried Brooke Siler's "Element Pilates for Weight Loss" DVD based on the review I read there, and I really like it.
ooo! there's one by Karen Voight...her website is karenvoight.com.
It's a dark purple DVD called "Core Fusion" (I think!!!). it's really good! however, I'm not into pilates anymore, but when I was, it was a doozie!!! check it out!