I have an old Schwinn Airdyne and love it. Have put over 13,000 miles on it so far without as much as a tuneup. Gives a great workout and the results show in my physicals. Sorry about not knowing of the models you stated, but you won't go wrong with a used Airdyne IMHO.

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95 SL500 Smoke Silver, Parchment 64K
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02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K