The question remains, "How much cardio?"
Because, if you want/need a lot of cardio, you may want to go to a stylized form of dance exercise--you can get the cardio you need while still getting toning at the arms and core in SharQui - The Bellydance Workout dvd, which is what I use and love.
And this recommendation comes from someone who gets loads of cardio with my own sequences and from the fairly frequent Masala Bhangra Workout class ...
Lesser artists borrow, great artists steal.
- Igor Stravinsky
Find a way.
(Said after swimming from Cuba to Key West without fins or shark cages)
Team Co-Leader of:
◈ Don't Want 2 be fat or skinny team www.sparkpeople.com/myspark/groups_i
Now 109 pounds less than at age 24–w/o surgery!