Which stair stepper to buy?

I am thinking about buying a used stair stepper. Here are my choices so far:

1) NordicTrack MTN 740: which has a built in fan, heart rate monitor & ifit compatible programs.

2) Stairmaster 4200 PT: which is gym quality & has warranty left until 2009, but no heart rate monitor.

The Stairmaster retail price is at least double that of the NordicTrack. I could purchase it used for a few hundred dollars more than a used NordicTrack.
Is it worth the price difference?

Unfortunately I have not seen or tried either of these machines except for online pictures.
Any suggestions would be appreciated. Thanks.
 
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