If you want a very affordable machine, your only options are NordicTrack, Nautilus or Horizon. NordicTrack gives you the best value of these.
NordicTrack has the best quality and design of any ellipticals in this price range. No other manufacturer has the ability to give people the quality that NordicTrack can with the economies of scale that they have. Just hope that you don't have to use their warranty services, they suck when you compare them to their competitors. As far as the equipment goes, however, they just produce better equipment.