Help! Not fond of cardio!

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Hi all! Just feelig a bit discouraged as I have hit the inevitable plateau! My SW 172 and CW 150-151 (I started Jan. 9, 2012). I solely workout at home and do some cardio like treadmill, elliptical trainer and pilates with rebounder (its like a trampoline). By working out at home, I tend not to push myself as hard as I should. I'm going to try Zumba for Wii until I feel comfortable enough to join a class. What are some of your best/favorite cardio workouts? Would love to hear them! I need a change! Thanks for reading!