Hi again Marina81,
If you want both cardio and strength, here are some thoughts I agree with the Intensity series, CTX series or Body Blast series.
Intensity Series is a great collection if you are up for it. I really enjoyed the challenge of this series.
Body Blast is fun, fun, fun. I thought the intensity was more moderate in relation to the Intensity series.
CTX has shorter cardio segments but they pack a punch. The strength work is focused on one body part per day.
If you only want to invest in a single DVD here are two options:
Terminator has three compilation workouts from the workouts of the intensity series. These can be grueling.
Timesaver DVD has 5 short workouts that are made from segments of the Bodyblast series. Similar in style to CTX. This would be more fun than a total wipeout. However, I found these useful during the holidays when time is scarce or when I need a bit of a break.