I've had a Precor EFX 5.23 for about a year now.
I was not interested in a model with handlebars. They do not provide anything close to an upper body workout IMO, so if you want a "total body workout" then do weight training. Also, at the time that I was researching elliptical trainers, no model with handlebars allowed variable inclination (pitch, to simulate going uphill). All of the handlebar models simulated increasing inclincation by increasing the resistance. I wanted variable incline in order to work different muscle groups.
Because I wanted variable incline and did not want handlebars, that eliminated Life Fitness. Having said that, the Life Fitness models did have some excellent features, such as variable stride length. I also liked the programming interface better than Precor and Cybex. If you want handlebars, and don't mind not having true variable inclination, check out the Life Fitness models.
The decisive factor between Precor and Cybex came down to comfort. For me, using the Precor felt more natural. The stride pattern of the Cybex Arc Trainer isn't terrible, but I found it uncomfortable to work out for longer than an hour on it.
I did not check out the models in the medium price range, because I wanted a top of the line frame. I am rather heavy (6 feet, 225 lbs) and the ProForm and NordicTrack models I tried in retail stores tended to flex and rattle when I used them on high resistance.
I read good reviews of the Octane Q35 and Q45, but there are no dealers in my area for local sales or service.
I've had a few service calls for my Precor, including two sets of cracked wheels. My wife and I use it a *lot* (about 90 minutes a day each). The wheel design has been changed, and the new wheels are a definite improvement. Precor provides one year of free service calls and a 10 year warranty on parts.
Epinions is an adequate place to start researching models. I believe Consumer Reports usually reviews exercise equipment in their January issues, to coincide with the numerous persons making New Year's resolutions. There is no subsitute for actually getting on a machine and working out, however. A model might look really good on paper, but might be uncomfortable for your individual stride. Most local dealers will not mind you showing up in workout clothes and trying a model out.
It would be a good idea to purchase from a local dealer. You might be able to get a better price online or from a warehouse dealer at a remote location, but service after the sale is critical. If something goes wrong, it helps to have somebody local to hold accountable for service calls.
I wouldn't recommend purchasing refurbished or remanufactured models, unless you happen to live close to the vendor offering the equipment for sale. Some ellipticals will inevitably turn out to be lemons, like any other mechanical device.
http://www.epinions.com/sprt-All-Exercise_Equipment-Elliptical_Trainers
http://www.precor.com/cons/efx/
http://us.home.lifefitness.com/content.cfm/ellipticalcross-trainers
http://www.octanefitness.com/products/elliptical_shop_guide.cfm
http://www.ecybex.com/products/CV/ArcTrainer/arctrainer.aspx