Gina,
Another good choice might be the CTX series, but it is kinda pricey for a first purchase.
With it you get 6 workouts. The first five give you cardio followed by one body part of weight work. You also get "Leaner Legs", which is working well for me right now. If you get the DVDs, (3 workouts on two DVDs), you have more choices, including doing all the upper body on one workout. I know you have specified more lower body, but using the whole CTX series has really helped me in that area....might be the varied cardio that is doing it for me, as I still have some stubborn body fat there.
Having said that, if you only want one DVD right now, I also like KPC/L&G. For overall weight loss, though, I found circuit-type workouts to be the most help: Step, Jump & Pump, Cardio & Weights, or Circuit Max.
If you haven't already done so, click on "Video Clips" above. You can preview almost every workout Cathe sells.
Julie