Hi, Shari! I think your purposes would be better served if you focused on individual DVDs, rather than trying to decide on one full series over the other.
From the Intensity Series, you could get the Boot Camp / Muscle Endurance DVD, which has all floor cardio snippets in Boot Camp and some primo muscle endurance conditioning both in Boot Cam and . . . well, Muscle Endurance.
From the Hard Core Series for cardio, you could get the Kick Max workout and the Muscle Max total-body conditioning DVD that incorporates weights AND bands (bands tend to promote muscle endurance rather than absolute muscle mass- and strength-building.
From Cathe's 2006 untitled series, consider Drill Max; its format is similar to Boot Camp with cardio and muscle conditioning circuits. It does incorporate a step but the step's use is moderate, and you can omit it in several cardio sections. Butts and Gutts, as previously suggested, is very good for the legs.
There are several other cardio workouts that don't use a step, some from the Cross Train Express (CTX) series and some from the Body Blast series. I do think that you should have at least one total-body muscle workout in your collection that hits upper as well as lower body. The Pyramid Upper / Lower Body DVD previously mentioned is very good, and very flexible with its premixes.
HTH -
A-Jock
ETA - please forgive the several thousand grammatical felonies in my post.