I am also interested to see the recommendations in this thread as we will be replacing ours in the not so distant future.
We have a NordicTrack that is about 10 years old that has had a lot of use. However, it has occasional fits where it will just stop during your workout. You have to reset it each time to start it back up. I will avoid NordicTrack on our next purchase.
On my next treadmill the number one requirement will be that the grab bars must move up with any increase in the incline. I am tall and when you are up to a 5-6 degree incline the stationary grab bars are extremely low. It is a safety issue to me, I like them to be at a comfortable height, regardless of incline, in case I lose my balance and need to grab onto them.
By the way.....and not to hijack the thread but I also hate to lubricate the tread. Very messy job and the recommended lube is way to expensive. Any recommendations on what you use?