My 'go to' when I feel I need to step it up again is to do IMAX 2 all the way through and then jump over to Cardio & Weights, weights only ,plus abs.
Really good total body work out. Otherwise, Bootcamp is an awesome total body work out. I love the fact that it's exactly an hour !
Others I fell in love with are: IMAX3, Bodymax 2, & KPC-Cardio Conditioning premix plus legs with ankle weights from L&G. I know,,,so many awesome work outs, so hard to choose !