If you're fairly experienced with Pilates, I'd recommend Hilary Burnett. Her workouts come in several different levels and she doesn't have long pauses for explanations between exercises - you just flow directly into the next one. You need to know what you're doing for this though and already know the finer points of technique - otherwise you'll get lost pretty quickly.
I also like the Stott videos (although some of them are heavy on the explanations so the flow isn't great) and Mari Winsor's videos which have good instruction.
Stebby