My absolute favorite cardio are my live Zumba classes! So much fun!!!
Otherwise, my 3 main styles are:
~athletic (i.e. kickboxing, some 'bootcamp' - LOTS of Kelly Coffey-Meyer)
~light dancey (i.e. Petra's Bootcamp Boogie)
~walking videos
I'm back to doing my classic Firms, 4x a week, with the above-mentioned cardio 5-6x. Just started so I'll have to let you know how it's working. But it's done wonders before!