I prefer a bowflex. They are fun, easy, and you see results right away. U can set it up anywhere, outside is where i have mine. Its the only workout i ve done in years, i have no need to think about...
Some of the top cardio exercise equipment the Bowflex Treadclimber ,Nordic track, Cybex exercise bicycles, Life Fitness equipment and the Pacenmaster Treadmills.
If you are overweight, you have lots of options. I highly recommend Gillian Michaels' 30-Day shred. All you need are two 5lb hand weights and 20-minutes a day.