I'm thinking of dumping my treadmill for an exercise bike. I'm on my feet all day with my job and I'm starting to feel some discomfort in my knees and feet so getting up on the old treadmill just ain't happening anymore. Any recommendations. I have only started to do a little research and haven't decided on a recumbent style or an upright. The only issue I have with recumbent is space, which is also a problem with the treadmill. I would like to be able to fit it into a closet when I'm done. Fitting it into a closet would be nice and a major plus, but not priority. Price wise I would like to keep it under $400.00 Any info would be great. Thanks!