I like Tracey Effinger's Squeeze, Squeeze Stronger and her lower body Squeeze which is quick at 30 minutes. Also, I like Pershing Square 2 (you need a small squeezable ball).
Tracey Mallet's Booty Barre is good - I like it better than her follow up one which includes abs.
Also, take a look at Exhale Core Fusion workouts. They can be tough and are great add on's. I hope that helps a bit.