I have an elliptical. I have foot, knee and back problems so using an elliptical puts a lot less stress on my joints than a treadmill would. It also has less moving parts so it's less likely to break down, though of course they all do eventually.
Ours is a tunturi (swedish I think) that cost about $600 new. Not many frills with it, but enough basic features and comes with a heart-rate monitor and heart-rate modes.
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