If you like moderately complex choreography (i.e. long combinations) I really LOVE Amy Bento's In the Ring. It's 60 min. long and has 4 combos with intervals in between each. Each interval uses a medicine ball. It's a ton of fun, and has terrific music. Amy's earlier one, Kickbox Extreme is also very good. I had a hard time getting over her form on punches in KBX, but I'm over it now and enjoy that workout as well. (Her form in ITR is better.)
A lot of people are talking about Tracey Staehle's newest one, Strike Zone so you might check out those threads. Good luck!
I also dearly love the Taebo Lives and Get Ripped advanced with Billy Blanks but he's not for everyone.
Jonahnah
Chocolate IS the answer, regardless of the question.