I have a Pacemaster Platinum Pro and we got a discount so I think we paid around $2K for it with the group discount. My local gym was buying these and some Precor models and offered a discount if you wanted to buy one for home use.
I really like it because it has a nice wide and long track so that if I am using or my (much taller) DH uses it, we both feel comfortable. Everything on it has a separate display (speed, time, incline, etc..) it has a nice HR monitor and you can also use something called "e-courses" which is like a different way to do workouts more similar to outside running. It has a good warranty, I think lifetime on the frame, 12 years for the motor, 5 years for the part and (I think) 1 year for the labor.
I also like it because you can speed it up to 12 MPH in little increments and the incline goes up to one of the highest (15%) which is good for someone (like DH) who likes to test his race walking and running on that type of incline.
Here's their website if you are interested:
http://www.pacemaster.com/
I personally wanted something that was well-constructed, had a good warranty and servicepeople to back it up, and had the options (separate displays, lots of program memory, etc..) we both wanted. DH wanted a longer track and a decently wide one, along with a good HR monitor (it exactly matches the HR on the watches we both have so we know it is accurate).
I don't know if you have a local store nearby that sells to health clubs or is more of a fitness store, but I recommend those if you do. Generally those salespeople have a lot more knowledge of exercise physiology and can really pinpoint what you need vs. what you don't really want. Good luck with this investment, it can be hard to find something but it worth the effort in the long run.